$1$ Nikolai is $74$ years old and is only now about to retire. If the current maximum monthly CPP retirement benefit payable at age $65$ is $$1,154\mathrm{.}58$ and Nikolai applies to receive his CPP pension this month, how much will Nikolai receive in monthly benefits?

a$)$ $$1,154\mathrm{.}58$

b$)$ $$1,570\mathrm{.}23$

c$)$ $$1,639\mathrm{.}50$

d$)$ $$2,027\mathrm{.}44$