Find the domain, period, range, and amplitude of the cosine function.y = -6 cos 4xa. domain =-1/2? x ?1/2-; period = 6; range: -6 ? y ? 6; amplitude=1/2b. domain=all real numbers; period=1/2 ?; range: -6 ? y ? 6; amplitude = 6c. domain = all real numbers; period=1/2-; range: -6 ? y ? 6; amplitude = -6d. domain =-1/2? x ?1/2-; period = 6; range: -6 ? y ? 6; amplitude=1/2