Use the following information for questions $3-4.$

Suppose you have the following information from $3$ documents

$1)$The firm is doing great

$2)$ The firm is profitable now

$3)$The firm is losing customers

$3.$ What is the tf$-$idf of the word fir?

A$)0\mathrm{.}159$

B$)1$

C$)0$

D$)0\mathrm{.}0884.$What is the tf$-$idf of the word customers?

A$)0\mathrm{.}159$

B$)1$

C$)0$

D$)0\mathrm{.}088$