The correct option is (a). Discretionary Income
The amount of income that a person or household has available to spend after deductions for taxes and other items is called discretionary income.
It is a subset of extra cash, and thusly there are a few similitudes between the two payment types.
It also can be utilized to pay for excursions, interests in retirement accounts, extravagant things, or any great administration that isn't required.
Formula for calculating discretionary income is:-
Discretionary Income = Gross pay - Charges(taxes) - All constrained installments (bills).
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