Is the Pre-Stressed Force Applied to the Tendon of a Rectangular

Multiple Choice

is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is

A) f = (P/A) +(Z/M)
B) f = (A/P) +(M/Z)
C) f = (P/A) + (M/Z)
D) f = (P/A) + (M/6Z)