A.
is a generalization of the perpetuity formula to cover the case of a growing perpetuity.
B.
is valid only when $g$ is less than $k$.
C.
is valid only when $k$ is less than $g$.
D.
is a generalization of the perpetuity formula to cover the case of a growing perpetuity and is valid only when $g$ is less than $k$.
E.
is a generalization of the perpetuity formula to cover the case of a growing perpetuity and is valid only when $k$ is less than $g$.