What makes an HP MFP easier to use and more productive than using the separate devices that it can replace?

What makes an HP MFP easier to use and more productive than using the separate devices that it can replace?
A . Many HP MFPs are Common Criteria Certified, and many more are in evaluation for Common Criteria Certification under the IEEE P2600 Protection Profile.
B. HP MFPs are compatible with the HP eSupplies app, which finds the right cartridge for your MFP from the palm of your hand.
C. An HP MFP has a single, easy-to-use interface that provides access to its many features and reduces the amount of training necessary for users.
D. HP MFPs conform to international energy standards, including Energy Star and Blue Angel, reducing stress on the power grid.

Answer: C