How should a Campaign developer restrict users from entering only one of three possible data values in a column called customerstatus?

How should a Campaign developer restrict users from entering only one of three possible data values in a column called customerstatus?
A . Create an onChange JavaScript trigger to alert the end user to the invalid value
B . Leverage the enableif keyword with an expression that evaluates the values for customerstatus
C . Leverage Enumerations in drop-down lists for the three allowed values
D . Apply a sysfilter to the form and filter on the values for customer status

View Answer

Answer: C