Your company uses custom payroll software from a small vendor. While they're good with support, recent events have you worried they might go out of business. What's the first thing you should look into to minimize disruptions in such an event? Choose the best response.

a$.$

Contract an electronic vaulting service

b$.$

Establish a software escrow agreement

c$.$

Set up a secondary system from another vendor

d$.$

Deploy it to a distributed system