Brief Exercise $2-2($Static$)$ Balance the accounting equation $($LO$2-2)$

Using the notion that the accounting equation $($Assets $=$ Liabilities $+$ Stockholders' Equity$)$ must remain in balance, indicate whether each of the following transactions is possible.

$\backslash$table$[[$Transactions$,\backslash$table$[[$Transaction$],[$Possible$?]]],[$a$.$ Cash increases; Accounts Payable decreases.,$],[$b$.$ Service Revenue increases; Salaries Payable increases.,$],[$c$.$ Advertising Expense increases; Cash decreases.,$]]$