从下面提供的答案中选出应填入下列英文语句中______内的正确答案。 Applications put computers to practic

从下面提供的答案中选出应填入下列英文语句中______内的正确答案。

Applications put computers to practical business(1), but below the(2)it's the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program,connect to networks and store(3)．

A traditional kernel provides all the functions for applications.The kemel(4)memory, I/O devices and parcels out processor time.

The kernel also supports securityand fault(5), which is the ability to recover automatically when parts of the system fail.