Jack has a computer at home that he uses to access the Internet, store and edit personal photos, and create and edit documents. Recently, he has come to realize that in order to keep the computer performing at its best, he needs to carry out regular system maintenance on the computer.

Jack can use the $\_\_\_\_$ program to locate and delete temporary files, such as installation files, Web browsing history, and files in the Recycle Bin.

a$.$ Disk Defragmenter

b$.$ Windows Registry

c$.$ Temporary Files

d$.$ Windows Disk Cleanup