Find the Area of the Region Under the Graph Of f

Multiple Choice

Find the area of the region under the graph of $f$ on $[ a , b ]$ .
$$f ( x ) = x ^ { 2 } - 2 x + 4 ; \quad [ - 1,2 ]$$
Select the correct answer.

A) 3
B) $- 12$
C) 12
D) $- 3$