Help me

hi,
i have 2 question.

1)In the following code snippet

Cmd> sh sample.sh

##sample.sh
##--------------------
#!bin/sh
echo $0

What will $0 return?
A) 0
B) 1
C) sample.sh
D) sample
E) All of the above

2)In the following code snippet

chmod 778 abcd.txt
if [ $? -ne 0 ]
then
echo "1234"
else
echo"456"
fi

What will be printed on the screen?
A) chmod
B) 778
C)1234
D) 456

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