Which of the following are types of service defined in ITIL?

Which of the following are types of service defined in ITIL? 1. Enabling 2. Core 3.
Enhancing 4. Computer

A.
2, 3 and 4 only

B.
1, 2 and 4 only

C.
1, 3 and 4 only

D.
1, 2 and 3 only