The project manager must maintain an effective communication linkwith the customer'ssatisfaction with the progress of the project. The project manager maintains this link through （） .

A. periodicprojectreports,periodicvisitstothecustomer,andtelephonicexchanges
B. subordinates,projectteammembers,andtheprojectsponsor
C. one-timereports,weeklyreports,andmonthlyreports
D. thetelephone,facsimile,anddatatransmission