Using wildcard metacharacters, how can one indicate a number is either 1, 2, 3, or 4?

Using wildcard metacharacters, how can one indicate a number is either 1, 2, 3, or 4?

Using wildcard metacharacters, how can one indicate a number is either 1, 2, 3, or 4?

a. 1-4
b. [1-4]
c. [1234]
d. [1,2,3,4]

Answer: B.