Which log shows the related events between these components?

An administrator is troubleshooting network communications between a vCenter Server and an ESXi 6.5 host.
Which log shows the related events between these components?

A.
/var/log/fdm.log

B.
/var/log/vpxa.log

C.
/var/log/hostd.log

D.
/var/log/auth.log

Explanation:
https://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.wssdk.pg.doc_50%
2FPG_ChA_Diagnostics.19.3.html