The angle between `i+j` line of the intersection of the plane ` vec rdot( hat i+2 hat j+3 hat k)=0a n d vec rdot(3 hat i+3 hat j+ hat k)=0` is a. `cos^(-1)(1/3)` b. `c0s^(-1)(1/(sqrt(3)))` c. `cos^(-1)(2/(sqrt(3)))` d. none of these