jQuery validation plugin ajax validation

$("#addSkuForm").validate({
        // Specify validation rules
        rules: {
            // The key name on the left side is the name attribute
            // of an input field. Validation rules are defined
            // on the right side
            sku_model: "required",
            n_c: {
                required: true,
                minlength: 12,
                number: true,
                maxlength: 12,
                remote: {
                    url: "/cost-price/n-c",
                    type: "GET",
                    data: {
                        t_n_c: function(){
                            return $('#n_c').val();
                        }
                    }
                }
                // Specify that email should be validated
                // by the built-in "email" rule
            },
            product_description: {
                required: true
                // Specify that email should be validated
                // by the built-in "email" rule
            },
            rcp: {
                required: true,
                min: 0
            },
            cost_price: {
                required: true,
                min: 0
            },
            sub_category: {
                required: true
            },
            margin: {
                required: true
            },
            subsidy: {
                required: true
            }
        },
        // Specify validation error messages
        messages: {
            sku_model: "Please enter sku model",
            n_c: {
                required: "Please enter the 12NC",
                remote : "12NC already exist"
            },
            product_description: {
                required: "Please provide product description"
            },
            rcp: {
                required : "Please enter RCP",
                number : true,
                min: "Value must be greater than 0"
            },
            cost_price: {
                required : "Please enter Cost Price",
                number : true,
                min: "Value must be greater than 0"
            },
            sub_category: "Please select sub category"
            /*margin: {
                required : "Please enter Margin",
                number : true
            },*/
            /*subsidy: {
                required : "Please enter Subsidy",
                number : true
            }*/
        },
        // Make sure the form is submitted to the destination defined
        // in the "action" attribute of the form when valid
        submitHandler: function(form) {
            /*form.submit();*/
            WRITE THE AJAX CALL HERE
        }
    });

For remote method, Just call the post call and get the true or false in string format.