For what value of “a” , the magnitude of a vector A= 2i^+j^+ak^ should be 3?

A. -2
B. 2
C. 4
D. Both A & B

Submitted by: Zahid Jagirani

The correct answer to the question: "For what value of “a” , the magnitude of a vector A= 2i^+j^+ak^ should be 3?" is "Both A & B".