'.BAT' extension refers usually to what kind of file?

BAT extension refers to Batch processing it's System file

The correct answer is;

option c) System file

Actually it's a "batch" file on Windows OS. It is very much similar to "shell script" found on linux (unix) OS.

c) System file >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Batch file or system file that is executed by operating system

System file,....................

>>>>>>>>>>>>>>>>>>>>>>>>>>  c) System file

batch file or  C -system file