Which TWO archiving formats are used to create an initramfs image?

A.
gzip

B.
tar

C.
rar

D.
cpio

E.
bzip2

Explanation:
See http://www.kernel.org/doc/Documentation/filesystems/ramfs-rootfs-initramfs.txt
All 2.6 Linux kernels contain a gzipped “cpio” format archive, which is extracted into rootfs when the
kernel boots up.