A user reports that their laptop takes a significantly long time to boot up and applications are sluggish when loading data. The laptop currently has a 5400rpm hard disk drive installed. Which of the following replacement parts would BEST improve the system's performance?
Upgrade the existing HDD to a larger 7200rpm HDD.
Add more RAM to the existing system.
Install a new battery with a higher capacity.
Replace the existing HDD with a solid-state drive (SSD).