Which of the following statements may be used to access the second command line argument to a script?

$ARG2 is not a special shell variable; it would only hold a value if the script explicitly assigned one to it.

$1 holds the first positional argument, not the second.

$2 is the standard POSIX positional parameter for the second command-line argument. The shell automatically populates $1 through $N with successive arguments, making $2 the correct and idiomatic way to access the second one inside a script.

$S2 is not a recognized positional parameter or special shell variable; it would evaluate to an empty string unless explicitly set.

Single quotes suppress all parameter expansion in bash, so '$2' produces the literal four-character string $2 rather than the value of the second argument.