The absolute maximum value of the function

is equal to :

a)None of these mentioned

b)2

c)4

d)0

e)-4

I know that the steps to find absolute minimum or maximus is:

1- find the critical number of f in {a,b}

2-Evaluate f at each critical number in [a,b]

3-Evaluate f at each endpoint of [a,b]

4-The smallest of these values is the minimum and the largest of these values is the maximum.

How can I find the absolute value in the question and the interval is not given ??