Question: Consider the single quotes and the double quotes when they are used as escaping characters on the UNIX Bourne shell. Which one of the following

Consider the single quotes and the double quotes when they are used as escaping characters on the UNIX Bourne shell. Which one of the following statements is the most appropriate?

Double quotes permit using $ to evaluate a shell variable and using back-quote for command substitution.

1Single quotes do not permit using $ to evaluate a shell variable but allow using back-quote for command substitution.

2Double quotes permit using $ to evaluate a shell variable but does not allow using back-quote for command substitution.

3Single quotes permit using $ to evaluate a shell variable and using back-quote for command substitution.

4None of the other answers to this question are correct.

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