Identify which of the following cases is protected by the expectation of privacy: A person smoking marijuana on the street with a police officer a few feet away from him
A police officer climbing the fire escape to take a look through your window and seeing that you have a gun on your bed for which he arrests you.
A police officer noticing that there is a cloud of smoke in your car, after which he demands to inspect the inside of your car for illegal substances.
A person exiting a gun store with an unregistered gun in his hand, which the police officer notices and asks for a license and permit.