CF4 is best described as having

1. non-polar bonds and a net dipole moment
2.polar bond and a net dipole moment
3.polar bonds and no net dipole moment

F is more electronegative than C, so the bond is polar.
However, the bonds are completely symmetrically arranged, so the polarity vectors add to zero.
The molecule is nonpolar
The answer is 3.

3. CF4 is symmetrical.

3