When selecting a PowerProtect DD model, which standard practices should be used to conservatively calculate capacity and throughput?

When selecting a PowerProtect DD model, which standard practices should be used to conservatively calculate capacity and throughput?
A . Capacity: First full backup + First incremental backup + (Weekly cycle * Number of weeks data is retained)
Throughput: Size of average backup / Backup window time
Allow for a minimum 20% buffer in both capacity and throughput
B . Capacity: First full backup + Incremental backups + (Weekly cycle * Number of weeks data is retained)
Throughput: Size of largest backup / Backup window time
Allow for a minimum 10% buffer in both capacity and throughput
C . Capacity: First full backup + First incremental backup + (Weekly cycle * Number of weeks data is retained)
Throughput: Size of average backup / Backup window time
Allow for a minimum 10% buffer in both capacity and throughput
D . Capacity: First full backup + Incremental backups + (Weekly cycle * Number of weeks data is retained)
Throughput: Size of largest backup / Backup window time
Allow for a minimum 20% buffer in both capacity and throughput

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Answer: D