$13\mathrm{.}6\%$ complete

Question

A systems administrator notices that several user accounts are frequently getting locked out. Simultaneously, during these lockout instances, the system did not record any logs$.$ Which of the following is the MOST likely explanation for the lack of logs during these events?

A$.$Unsecure network connection

B$.$Malware attack

C$.$Log tampering or deletion

D$.$Account lockout