What is "security through obscurity?"

Question $29$ options:

A security practice that uses tricks and other information hiding practices as is based upon the assumption that adversaries are not as smart as you and will not be able to figure things out.

A physical security practice that removes external identifying information from facilities to keep drive$-$by attackers from finding WiFi networks.

A security practice that uses random, unguessable passwords to prevent attackers from launching password based attacks.

The use of encryption to hide or obscure information and make it more difficult for attackers to discover your secrets$.$

Baseline