Su & Wong, CPAs is not independent with respect to Radar Corporation because the firm provides bookkeeping services for the client and makes management decisions regarding check coding. Zee & Brock, CPAs is performing an attest engagement for Radar Corporation and is using professional staff from Su & Wong, CPAs on the engagement. Is Zee & Brock, CPAs' independence with respect to Radar Corporation impaired due to the use of Su & Wong, CPAs' employees on the attest engagement?

A) Yes, independence is impaired

B) No, independence is not impaired

C) Independence is only impaired if a partner from Su & Wong, CPAs participates on the attest engagement

D) Independence is only impaired if Su & Wong, CPAs are included within the attest engagement letter with Radar Corporation

Please answer with reference to appropriatesource (i.e. AICPA Code), and I do not want sonyplayer1987 answering any more of my questions.