Linux Startup and Shutdown Question: Download Linux Shutdown & Startup PDF

Which of the following is not a valid run-level?
a) S
b) 0
c) 8
d) 1

c) 8

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On Linux, initrd is a file: a) containing root file-system required during bootup b) Contains only scripts to be executed during bootup c) Contains root-file system and drivers required to be preloaded during bootup d) None of the above	Which file is read by init to get the default run-level? a) /etc/profile b) /etc/init c) /etc/boot d) /etc/inittab