A rectangular gym has an area of 4x^2 ft^2. The school decides to add a new weight room. The total area of the gym and the weight room is (4x^2 + 480) ft^2. What does the constant term represent in terms of this problem?

a. The new weight room can hold 480 people.
b. The new weight room has an area of 480 ft^2.
c. The gym has an area of 480 ft^2.
d. The new weight room has an area of 4x^2 ft^2
I'm between a, and b.