a) Hard-coding a login pair directly into the script
b) File-based authentication
c) Data-based authentication
d) PEAR’S HTTP authentication

Answer: a
Explanation: The simplest way to restrict resource access is by hard-coding the username and password directly into the script. In this authentication method, changing the username or password can be done only by entering the code and making the manual adjustment. This is one of the drawbacks of hard-coding a login pair directly into the script.