Identify interface and cable issues (collisions, errors, mismatch duplex, and/or speed)

A Network Engineer is investigating a fault where a specific workstation in the 10.16.108.0/22 subnet cannot maintain a reliable connection to the network. The link drops and reconnects constantly. The engineer pulls the statistics for the access switch port:

Switch# show interfaces fastEthernet0/12
FastEthernet0/12 is up, line protocol is up (connected)
  ...
  Half-duplex, 100Mb/s, media type is 10/100BaseTX
  ...
  3450 packets input, 400456 bytes
  1250 input errors, 1245 CRC, 5 frame, 0 overrun, 0 ignored
  4500 packets output, 500500 bytes, 0 underruns
  15 collisions, 2 interface resets

Based on the diagnostic output, which two interpretations justify investigating physical-link and duplex conditions without proving a specific failed component? (Choose 2.)