Which step should the administrator consider to improve backup performance?

A NetBackup policy is configured to back up the following paths for a client:

D:stage

E:data

E:home

F:production

Multistreaming is enabled for the backups, and multiplexing is set to 4. Backup streams are running slowly.

Which step should the administrator consider to improve backup performance?
A . increase the multiplexing level
B . back up only one stream from each physical device on the client
C . disable multistreaming
D . increase the number of data buffers