Companycom has plans to deploy a large database solution. Their primary requirement is minimal user access downtime. They are comparing a single server implementation with a two server deployment. What solution would they use to avoid downtime for OS software maintenance?（）

Apply OS updates once a year
B. Utilize a GPFS cluster solution
C. Implement a two server deployment with HACMP
D. Install a single server implementation with HACMP failover to a second LPAR