A computer boots up with the error "CMOS Checksum Failure." Which of the following components needs to be replaced？（）

单项选择题AnA+CertifiedTechnicianMUSTdoaninstallonaWindowsXPsystemfromthedistributionCD.However，thesystemdoesnotbootfromthisCD.WhatistheMOSTlikelycauseofthisproblem？（）

A.The CD is defective.
B.The CD is not bootable.
C.The CD-ROM drive is defective.
D.The Boot Sequence is not set in the BIOS to boot first from the CD

单项选择题WhichofthefollowingisNOTaphaseofthetroubleshootingprocess？（）

A.confirm the repair
B.define the problem
C.document the results
D.simplify the problem