Which of the following is a type of replication in which all files are replicated, all of the time?

Constant or continuous replication ensures that every change made to a file is replicated immediately or with minimal delay to a secondary location, meaning all files are replicated all of the time as they are modified.

Application-consistent replication ensures the data being replicated is in a usable state for applications, but it does not specify the frequency of replication as 'all the time'.

Synthetic full refers to a backup method where a full backup is created from previous full and incremental backups, not a type of continuous replication.

Full replication typically refers to a complete copy of data at a given point in time, not necessarily continuous or 'all the time' replication of changes.