Task: Question Answering
Input (English): Problem: in the x - y plane, there are 4 points ( 0,0 ), ( 0,4 ), ( 8,4 ), and ( 8,0 ). if these 4 points makes a rectangle, what is the probability that x + y < 4 ?
Options: a. 1 / 2, b. 1 / 3, c. 2 / 3, d. 1 / 4, e. 2 / 5
Output (English): d