Which Statement is always true?

If work how energy is transferred, and work is the product of force times distance, then all forces transfer energy

The value of the dot product of two vectors depends on the particular coordinate system being used.$$

If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy.$$

If the dot product of two nonzero vectors is non$-$zero, the vectors must be perpendicular to each other.$$