How do you determine the acid$-$test ratio?

Question $9$ options:

$1)$

The sum of cash and short$-$term investments divided by short$-$term debt.

$2)$

Current assets divided by current liabilities.

$3)$

Current assets divided by short$-$term debt.

$4)$

The sum of cash, short$-$term investments and net receivables divided by current liabilities.