Assertion (A): Increasing the electric field applied to a metallic conductor increases the drift velocity of its free electrons.
Reason (R): Mobility of free electrons in a metallic conductor increases with the applied electric field.
Choose the correct alternative:
a) A is true, but R is false
b) Both A and R are true, and R is the correct explanation of A
c) A is false, but R is true
d) Both A and R are false