How To Take Approver's Input- Providing a Drop Down field

Now  we know how to put a place holder for approver comments.Now we will learn how we can provide a list of values, so that approver can select a possible values from the drop down.

Basic Requirement
Our new requirement looks like "when a person applies for a leave, it should go his/her supervisor for approval. Approver must be able to provide his/her comments for approval or rejection of the requisition(comments is optional).and once it is approved save the information in database . If the leave gets rejected, don’t store any information in database."
Now we will change our requirement a bit. It is as mentioned below"when a person applies for a leave it should go his/her supervisor for approval. Approver must be able to provide his/her comments for approval or rejection of the requisition(comments optional). Approver must also be able to select the Organization Leave Type from a list of values . If the leave gets rejected, don’t store any information in database."

The possible "Organization Leave Type" list of values are
1)  Medical Leave
2) Personal Unpaid Leave
3) Personal Paid Leave
(Change requirement is in bold)

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