If drive C is running out of space and there isunallocated spaceavailable on the disk, the best solution is topartition the unallocated spaceand extend drive C to include the new partition. This can be done without significant downtime and will immediately provide more space for the system.

Partition the unallocated space (Answer E):This is the simplest and least disruptive method to increase the available space on drive C.

Decreasing the page/swap file (Option A):This may free up some space but can negatively impact system performance.

Reformatting (Option B):Reformatting would result in significant downtime and data loss, making it an impractical option.

Whole disk encryption (Option C):This does not solve the issue of disk space.

Enforcing disk quotas (Option D):Disk quotas manage space usage but won’t free up space on drive C.

CompTIA Server+ Reference:This topic is covered underSK0-005 Objective 3.3: Troubleshoot common server problems.