Using the Excel formula, how do you calculate the net operating income? Only one answer is correct: a$.$ b$.$NOI $=$ PGI $-$ Debt ServiceNOI $=$ EGI $-$ Debt ServiceC.d$.$ e$.$ f$.$NOI $=$ PGI $+$ Total Expenses $-$ Debt ServiceNOI $=$ EGI $+$ Total Expenses $-$ Debt ServiceNOI $=$ PGI $+$ EGI $+$Total ExpensesNOI $=$ EGI $+$ Total ExpensesNOI $=$ PGI $-$ V$/$L $-$ Debt Serviceh.NOI $=$ EGI $+$ Capex Reserve $+$ Total Expenses $+$ Total Expense RecoveryNOI $=$ EGI $-$ V$/$L $-$ Debt ServiceNOI $=$ PGI $-$ Capex Reserve $-$ Total Expenses