Exp) Option c is the correct answer

Statement a is incorrect. States being not indestructible is the unitary feature of the constitution.

Statement b is incorrect. No equality of state representation in Rajya Sabha is the unitary feature of the constitution. The states are given representation in the Rajya Sabha on the basis of population. Hence, the membership varies from 1 to 31.

Statement c is correct. Bicameralism is the federal feature of the constitution. Statement d is incorrect. Integrated Audit Machinery is the unitary feature of the constitution.