10) At time t = 0, a reservoir begins filling with water. For t> 0 hours, the
depth of the water in the reservoir is increasing at a rate of R(t) inches per
hour. Which of the following is the best interpretation of R'(2) = 4?
(a) The depth of the water is 4 inches, at t = 2 hours.
(b) The depth of the water is increasing at a rate of 4 inches per hour, at t = 2
hours.
(c) The rate of change of the depth of the water is increasing at a rate of 4
inches per hour per hour at t = 2 hours
(d) The depth of the water increased by 4 inches from t = 0 to t = 2 hours.