Which statement is correct about recording an allowance for doubtful accounts?

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Part 1

A.

Net accounts receivable is recalculated when there are changes recorded in the Allowance for Doubtful Accounts contra account.

B.

Comparability is the reason an allowance for doubtful accounts is needed.

C.

Accounts receivable are not adjusted for known uncollectable amounts.

D.

An allowance for doubtful accounts does not require estimates or judgments.