Challenge 1 / 3

What is the primary advantage of passing an object that implements MailerInterface to the FriendHarvester class, as opposed to using a specific class like SmtpMailer?

It reduces the need for interfaces in PHP.

It enforces stricter code standards.

It allows the FriendHarvester class to accept any mailer type that implements the interface.

It makes the code more complicated and harder to maintain.

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