A frame $$ABCD$$ is supported by a roller at $$A$$ and is on a hinge at $$C$$ as shown below:

The reaction at the roller end $$A$$ is given by

Pick the incorrect statement from the following four statements:

The stress-strain diagram for two materials A and B is shown below: The following statements are made based on this diagram:
I. Material A is more brittle than material B.
II. The ultimate strength of material B is more than that of A.
With reference to the above statements, which of the following applies?

The four cross sections shown below are required to be ordered in the increasing order of their respective shape factors.