A technician is troubleshooting a lack of Internet connectivity affecting their entire office. The technician suspects the issue is with their Internet Service Provider failing to provide service.Which of the following command line tools should the technician use to BEST test this theory？（）

A.Biometric
B.Keypad
C.Barcode
D.Key lock

A.Update drivers， update operating system （e.g. Windows Update）， create server baseline， createa new network diagram， update change management procedures
B.Create server baseline， label server， store vendor-specific documentation， update networkdiagrams， update asset tracking information
C.Create server baseline， assign server roles， install tape drive， delete network diagram， labelserver， update operating system （e.g. Windows Update）
D.Install applications on server， install external drives， toss vendor-specific documentation，update network diagrams

A.Directory services server
B.NTP server
C.DHCP server
D.DNS server