Question

If the dot product of two nonzero vectors is zero, the vectors must be perpendicular to each other. if the dot product of two nonzero vectors is zero, the vectors must be perpendicular to each other.
a. True
b. False

Answer 1

The correct question is
If the dot product of two nonzero vectors is zero, the vectors must be perpendicular to each other.

we know that
If two vectors are perpendicular or orthogonal  the scalar product must be zero, 

hence
the answer is true

Answer 2

According to edjenuity this is true.