A fully distributed database management system is working as expected for a large company with four separate office buildings, each with their own database infrastructure. The data processors do not do any of the transaction processing. If necessary, how would the company increase transaction processing resources without affecting the host database systems?

a$.$ Add more database hosts to the network.

b$.$ Add more storage to the database hosts.

c$.$ Add more workstations to the network.

d$.$ Add more data managers to the network.