Why did the line-item veto exist for only a short time?

a. Governors already had a line-item veto at the state level.
b. Bill Clinton used the line-item veto to excess.
c. The line-item veto was redundant with the pocket veto.
d. Congress voted to remove the line-item veto power.
e. The Supreme Court ruled the line-item veto unconstitutional.

e