The frequency response of a first order system, has a phase shift with lower and upper bounds given by________________? August 24, 2021March 5, 2019 by admin The frequency response of a first order system, has a phase shift with lower and upper bounds given by________________? A. – ∞, π/2 B. -π/2, π/2 C. -π/2, 0D. 0, π/2