Answer:
Create a validation rule using ISPICKVAL()
Explanation:
Solution
This can be achieved by creating a a validation rule using ISPICKVAL()
Create a Validation Rule Based on a Pick list
: The ISPICKVAL() are very important for creating validation rules that check whether a definite pick list value is chosen. for instance, say you want another person to enter a reason when they change a case's Status pick list value to increase.
Clicking a menu opens a drop-down list of commands and options. According to Merriam dictionary, menu is defined as a list of things that you can choose from ; especially computers or a list shown on a computer from which you make choices to control what the computer does.
The Cenozoic Era is known as the Age of mammals