A right triangle has base x feet and height h feet, where x is constant and h changes with respect to time t, measured in seconds. The angle θ, measured in radians, is defined by tanθ=hx. Which of the following best describes the relationship between dθdt, the rate of change of θ with respect to time, and dhdt, the rate of change of h with respect to time?AP CALC AB UNIT 4.4 MCQa. dθdt=(xx2+h2)dhdt radians per secondb. dθdt=(x2x2+h2)dhdt radians per secondc. dθdt=(1x2+h2√)dhdt radians per secondd. dθdt=tan−1(1xdhdt) radians per second