The stress strain curve of concrete as per IS: 456 is
APerfect straight-line upto failure
BStraight upto 0.002 and parabolic upto failure
CParabolic upto 0.002 & amp; then uniform upto failure
DLinear upto 0.002 & amp; uniform upto failure
APerfect straight-line upto failure
BStraight upto 0.002 and parabolic upto failure
CParabolic upto 0.002 & amp; then uniform upto failure
DLinear upto 0.002 & amp; uniform upto failure