What is the output of the following code:
import re
result = re.sub(r's', '-', 'This is a test.')
print(result)

A. A sequence of characters that defines a search pattern B. A built-in function C. A mathematical expression D. A special data type

A. It compiles a regular expression pattern into a regular expression object B. It converts strings to regular expressions C. It defines a new class D. It imports the re module

A. re B. regex C. pyregex D. none of the mentioned

A. By using the re module B. By using the regex keyword C. By including it as a string D. By using the regx function