A.ping–l1000–t192.168.1.2 B.ping–n192.168.1.21000 C.ping192.168.1.2–t1000 D.ping192.168.1.2–l1000
A.1310~1550nm B.1300~1550nm C.850~1600nm D.630~1650nm
A.1.4675 B.1.4670 C.1.4672 D.1.4672