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$$ PID of current shell echo "my PID = $$"
$! PID of last background command ls & echo "PID of ls = $!"
$? exit status of last command ls ; echo "ls returned code $?"
$0 Name of current command (as called) echo "I am $0"
$1 Name of current command's first parameter echo "My first argument is $1"
$9 Name of current command's ninth parameter echo "My ninth argument is $9"
$@ All of current command's parameters (preserving white space and quoting) echo "My arguments are $@"
$* All of current command's parameters (not preserving white space and quoting)

So answer will be D

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