A. $ allows the agent to enter a value and Variable is a fixed value.

B. $ pulls in a dynamic value from the database and Variable allows the agent to enter a value.

C. Variable is a fixed value and $ pulls in a dynamic value from the database.

D. Variable pulls in a dynamic value from the database and $ allows the agent to enter a value.

E. Variable pulls in a dynamic value from the database and $ is a fixed variable.