Which of the following software types are considered as System Software?Operating SystemsInterpretersReal time softwareVirus ScannersDisk Defragmenters

The software types that are considered as System Software from the list you provided are:

1. Operating Systems: These are the most crucial part of system software. They manage all the hardware and software on a computer. Examples include Windows, MacOS, Linux, etc.

2. Interpreters: These are also part of system software. They translate high-level programming languages into machine language.

3. Disk Defragmenters: These are utility software that are part of system software. They rearrange files stored on a disk to occupy contiguous storage locations to increase efficiency.

Real-time software and Virus Scanners, while important, are not typically classified as system software. Real-time software is a type of software which functions within a time frame that the user senses as immediate or current. Virus Scanners are a type of utility software used to prevent, detect, and remove malware.