Based on the provided requirements, the code should be revised to apply a 55 percent discount for clients older than 40 who buy from category "C," while all discounts for category "A" should be revoked. The correct revised code snippet would be:
if age > 40:
# 15 percent discount
discount = discount + (0.15 * amount)
if category == 'C':
# 55 percent discount
discount = discount + (0.55 * amount)
The responses using incorrect syntax or logic would not reflect these requirements. The only correct and complete version related to the new policy is the one provided above.
For a streamlined version without the unnecessary duplication, it clearly indicates that if the client is older than 40 and in category "C," they receive a 55 percent discount while maintaining the existing 15 percent discount (not applicable for category "A" anymore).