Q$17$ A supplemental employee retirement plan $($SERP$)$ is

I. a qualified deferred compensation plan.

II$.$ often referred to as a salary continuation plan.

III. a method of providing additional retirement income to executives.

IV$.$ a plan that complements existing retirement plans to bring executive benefits up to desired levels.

a$.$ II$,$ III, and IV$.$

b$.$ III and IV$.$

c$.$ I, II$,$ and III.

d$.$ I and II$.$