Maria works as a nurse practitioner at a local clinic. Her projected social security benefit at full retirement age of $67$ is $$3,945$ a month $.$ She has just turned sixty years old and has now decided to retire $.$ Using the approximate $"$ Rule of Thumb $"$ approach $,$ about how much monthly social security income will she be eligible for if she does retire $?$ A$.$ $ $3,234\mathrm{.}90$ B$.$ None $,$ since she is not eligible $$2,288\mathrm{.}10$ D$.$ $ $2,761\mathrm{.}50$