If a company has an accounts receivable turnover of $5$ times a year and gives customers $30$ day terms, which of the following describes the effectiveness of the company at collecting outstanding accounts receivable?

a$.$ effective, the turnover should be less than $12$

b$.$ effective, the company had no write offs

c$.$ ineffective, the turnover should be $12$

d$.$ effective, the turnover should be more than $12$