makes the hardware usable, while commands it to perform specific tasks. a.) The operating system, RAM b.) The CPU, RAM c.) The application software, the hard disk d.) The operating system, the application software

a then c

Explanation:

Without an operating system you just have a pile of metal, and the program contains code, which is just a series of commands

d.) The operating system, the application software

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answerthey protect the head and neck in rear impacts;