For a president of a publicly held corporation hired in $2021,$ which of the following is not subject to the $$1$ million limit on executive compensation?

a$.$ Contribution to pension plan.

b$.$ Contribution to medical insurance plan.

c$.$ Premiums on group term life insurance of $$50,000.$

d$.$ "Contribution to medical insurance plan", "Contribution to pension plan", and "Premiums on group term life insurance of $$50,000",$ are not subject to the limit$.$