Which of the following are types of PHP authentication implementation methodologies?
i) Hard-coding a login pair directly into the script
ii) File-based authentication
iii) Data-based authentication
iv) PEAR’S HTTP authentication
a) ii) and iii)
b) i) and iv)
c) i), ii), iii) and iv)
d) Only iv)

Answer: c
Explanation: The method PEAR’S HTTP authentication is used to provides a framework for user authentication on the HTTP. The data-based authentication is the process of confirming that a user who is attempting to log in to a database is authorized to do so. In the file-based authentication as some small sites does not have a need for database back-end to store data, but security is still important either the site is big or small. They need to authenticate some folder or file and want to set access credentials for that. One can handle such by using file-based authentication using PHP. The simplest way to restrict resource access is by hard-coding the username and password directly into the script.