The Enable FIPS mode option is presented during a fresh NetBackup installation of primary, media, client, or clustered server software. Cohesity NetBackup Installation Guide procedures show that, during local, remote, or clustered server installation, the installer displays the FIPS Compliance in NetBackup screen where the administrator can enable or disable FIPS mode; by default, FIPS mode is disabled. The guide further states that enabling FIPS causes the NetBackup installer and subsequent operations to run in FIPS mode, and that enabling it during clustered installation applies it to the nodes added on the NetBackup Remote Hosts screen. Client installation follows the same model: the Windows client installation procedure includes a FIPS Compliance in NetBackup screen where FIPS mode can be enabled or disabled. Option C is incorrect because Cohesity explicitly states that NetBackup does not support changing FIPS mode during upgrade; it must be enabled before upgrade or after upgrade as a post-install configuration. Reference topics: NetBackup Installation Guide, FIPS Compliance in NetBackup, and Enable FIPS mode on NetBackup during installation.