When is it appropriate to use a sequence?

A.
When you want to control the order in which triggers are fired.

B.
When you want to control the order in which stored procedures can be invoked.

C.
When you want to automatically generate a numeric value that is not tied to any specific
column or table.

D.
When you want to automatically generate a numeric value for each row that is added to a
specific table.

Explanation: