Which one of the following extraordinary powers, the Indian Constitution provides to the Centre to deal with an emergency arising out war, external aggression or armed rebellion? Select the correct answer using the following codes. (Rajyaseva Pre 2013)

(a) Centre can modify the provisions relating to the distribution of revenue between the Centre and the states.

(b) Centre can give directions to any state as to the manner in which its executive powers are to be exercised.

(c) Parliament can make laws with respect to any matter enumerated in the State List

(d) Centre can order the reduction of salaries of state employees, including the judges of High Court.