Please explain this ques

Solution,
The magnitude of the vector is 15 units.
So,
532+532+532=75+75+75=225 = 15 units.
Also,
the angle made by the vector with x and z axis are same. So, the x- and z-component of the vectors must be same.
Looking into the options, we found
Option (A) is the CORRECT answer.

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