Two identical coils each have self-inductance L and mutual inductance M. Which statements are correct?

Select all that apply

• Option A

  Series-aiding inductance is 2(L+M).

• Option B

  Series-opposing inductance is 2(L-M).

• Option C

  The difference of the two measured inductances is 4M.

• Option D

  Their arithmetic mean is 2L.