Which script, in the linux/scripts directory, can be used to add up grades or updated code to the 2.6.xx kernel source code?

Which script, in the linux/scripts directory, can be used to add up grades or updated code to the
2.6.xx kernel source code?

A.
patch

B.
patch-kernel

C.
kernel-update

D.
upgrade-kernel

E.
upgrade

Explanation:
See http://answers.oreilly.com/topic/36-how-to-patch-a-linux-kernel/