ApSeriestechnicalspecialistisperformingasolutionsassurancewithacustomerforanewsingle-frame10-nodep655systembeingattachedtoacurrentlyinstalledHMC.Whichofthefollowingquestionsshouldbeaskedtogatheralltherequiredinformationtodeterminewhetherthep655solutioncanconnecttotheHMC？（）
A.ArethereatleasttenRS-232portsavailableontheHMC？
B.ArethereatleasttenRS-422portsavailableontheHMC？
C.ArethereatleasttenRS-232andtwoRS-422portsavailableontheHMC？
D.ArethereatleasttwoRS-232andtenRS-422portsavailableontheHMC？
参考答案：C
