Henry is starting a t-shirt printing business and plans on selling each shirt for $30, with his cost being $8 per shirt. the equipment will cost $1200.

henry orders 600 shirts and determines that the profit for his new business is modeled by the function p = 22x - 1200. what is the domain of this function in this context?
a) all real numbers
b) {0 ≤ x ≤ 600}
c) {0 ≥ x ≥ 600}
d) {-1,200 ≤ p ≤ 2,000}