If , find the value of

Choices:

a)

b)undefined

c)

d)

e)

alright, heres where im at right now:

1)It could be undefined because is not in the domain of f(x)?

2)the answer is and my prof made a mistake(seems unlikely since he's been doing this for 20 years)?

3)my friend says its ?

Can anyone confirm which is correct with justification?

Thanks!