A vector of magnitude 5 and perpendicular to ^i−2^j+^k and 2^i+^j−3^k is
O 5√3/3(^i+^j−^k)
O 5√3/3(^i+^j+^k)
O 5√3/3(^i−^j+^k)
O 5√3/3(−^i+^j+^k)