Clocks (also called timers) are essential to the operation of any multiprogrammed system. They maintain the time of day, and prevent one process from monopolizing the CPU. How are clocks implemented

The answer is below

Explanation:

The clock in the CPU is made of three elements including the following:

1. Crystal oscillator

2. A counter

3. A holding register

All these clock elements combined and generate interrupts at known periods or duration.

However, the clock has a powered battery back up which is implemented with a form of low-power circuitry similar to that of digital watches.

The purpose is to prohibit the current time from being failed when the computer is powered off or shut down.

d?

explanation:

the today function returns a valid value without any arguments.

the today function returns the current date based on the computer's date setting and formatted as a date. today takes no parameters, but requires that you use empty parentheses