Nikolai is $74$ years old and is only now about to retire. If the current maximum monthly CP retirement benefit payable at age $65$ is $$1,154,58$ and Nikolai applies to receive his CPP pension this month, how much will Nikolai receive in monthly benefits? a$)$ $$1,154\mathrm{.}58$ b$)$ $$1,570\mathrm{.}23$ c$)$ $$1,639\mathrm{.}50$ d$)$ $$2,027\mathrm{.}44$