How to add a static or predefined dropdown to all the rows of a particular column in jqgrid ?

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jQuery

JQGrid

jQuery-UI

I have few columns lets say "action", "roll number", "employee name","salary" in a table.

other columns like "roll number", "employee name","salary" i will fetch value from DB and store it. but in the first column "Action" i need to add a default dropdown list for all the rows in it. the list is 1.Add,2.Edit,3.remove.

i tried various options which are not working for me.Please help me write a code for this.

What I have tried:

function loadEmployee(){
var options= { '1': 'Add', '2': 'Edit', '3': 'Remove' };
$("#NSC_table").jqGrid({
url:'servlet/WebFrontServlet?option=inquiry&action=getApproverRec',
colNames:['Action', 'roll number', 'Employee name', 'Salary'],
colModel:[
{name: 'Action', index: 'Action', width: 60, editable: true, edittype: "select", formatter: 'select', editoptions: { value: options } },
{name:'roll number',index:'prod', align:'left', width:100},
{name:'Employee name',index:'MBG', align:'center', width:50},
{name:'Salary',index:'WT_site', align:'center', width:70},
rowNum:200,
width:'1125',
height: 'auto',
autowidth:false,
scrollOffset:0,
shrinkToFit: false,
loadonce: true,
sortable: true,

i also tried pasting the harcoded values to the editoptions: field like below line.

{name: 'Action', index: 'Action', width: 60, editable: true, edittype: "select", formatter: 'select', editoptions: { value: "1:Add;2:Edit;3:remove" } }

Both of the options are not working.Please help me with the code. Thanks in advance.
They are not throwing errors but i didn't get drop down in my Table. i am new to UI developmentso not aware of what will be the mistake..