9 Which of the following would be an example of amortization?

9 Which of the following would be an example of amortization?

a)

The cost of a patent on an "app" spread out over the useful life of the "app".

b)

The cost of a new phone system spread out over the useful life of the phone system.

c)

both a) and b) are examples.

d)

neither a) nor b) are examples.

The answer is A but I wonder why, what's the difference between A and B