12. In operating system, each process has its own __
a) address space and global variables
b) open files
c) pending alarms, signals and signal handlers
d) all of the mentioned
Explanation: In Operating Systems, each process has its own address space which contains code, data, stack and heap segments or sections. Each process also has a list of files which is opened by the process as well as all pending alarms, signals and various signal handlers.