Consider the following statements
1. Distortion - energy theory is in better agreement for predicting the failure of ductile materials
2. Maximum normal stress theory gives good production for the failure of brittle materials
3. Moduli of elasticity in tension and compression are assumed to be different in the stress analysis
of curved beams
Which of these statements is/are correct?
(a) 1, 2 and 3 (b) 1 and 2 (c) 3 only (d) 1 and 3