The Media server.
Since the media server is the VMware backup host, it is performing both the function of media server (bptm and bpbrm) and the client (bpbkar).
This is the NBU explanation of status 10:
Explanation: The system memory allocation fails because of insufficient system memory available. A possible cause is that the system is overloaded with too many processes and not enough physical or virtual memory.
Recommended action: Free up memory by terminating any unneeded processes that consume memory. Add more swap space or physical memory.
Please also read the following chapter in NetBackup Backup Planning and Performance Tuning Guide : Chapter 11 OS-related tuning factors for Windows