Linux OS Shell Question: Download Linux Shell PDF

In the shell, by default, all variables are considered and stored as:
a) string
b) integer
c) character
f) float

a) string

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Which one of the following is not a valid shell variable? a) _san b) san_2 c) _san_2 d) 2_san	What is the output of this program? #!/bin/bash san_var="google" echo "$san_var" echo '$san_var' echo '"$san_var"' echo "'$san_var'" echo $san_var exit 0 a) google $san_var "$san_var" 'google' $san_var b) google google "google" 'google' google c) program will generate an error message d) program will print nothing