Which combination of the following features will suffice to characterize an $$OS$$ as a multi-programmed $$OS?$$
$$(a).$$ More than one program may be loaded into main memory at the same time for execution.
$$(b).$$ If a program waits for certain events such as $$I/O$$, another program is immediately scheduled for execution.
$$(c).$$ If the execution of a program terminates, another program is immediately scheduled for execution.

Which of the following does not interrupt a running process?

A multi-user, multi-processing operating system cannot be implemented on hardware that does not support:

Which of the following actions is/are typically not performed by the operating system when switching context from process $$A$$ to process $$B$$ ?