Which utility programs are being described below?

a Software that runs in the background and checks for malware; suspect programs are quarantined and deleted if necessary b Software that rearranges data on a hard disk drive (HDD) to reduce the scattering of the data stored on the HDD c Software that manages access control and user accounts and also protects network interfaces d Program that supplies static or moving images on a monitor when the computer has been idle for a period of time e Software that communicates with the operating system and translates data into a format understood by an input/output device