An operating system

is the chief hardware unit in a computer.
is loaded into the computer each time it needs to carry out an operation.
ensures that programs will not run on the computer at the same time.
allocates resources like memory to programs that are running.
all of the above.

How do we use the sumif formula (when dealing with different formats) ?

Which network media uses different regions of the electromagnetic spectrum to transmit signals through air? uses different regions of the electromagnetic spectrum to transmit signals through air.

Select the correct answer. andre was recently hired by an organization to check for system vulnerabilities. he is supposed to exploit these vulnerabilities and create a report on the extent of damage to which the system was susceptible. what position does andre hold in this organization? a. information security analyst b. information assurance manager c. penetration tester d. network security engineer e. chief information security officer