The value(s) of μ for which the straight lines →r=3ˆi−2ˆj−4ˆk+λ1(ˆi−ˆj+μˆk)and →r=5ˆi−2ˆj+ˆk+λ2(ˆi+μˆj+2ˆk) are coplanar is/are :
A)5+√33/4
B)−5+√33/4
C)5−√33/4
D)−5−√33/4