In the scenario in the lab, marina neglected to use a(n) on her smartphone, which meant that anyone could gain immediate access to her contacts and other private information

I believe the answer is: Screen lock

Screen lock in smart phones consisted of  passwords that usually utilize combinations of numbers or pattern, which prevent non-owners to access the phone without the owner's consent
Failing to give correct input for the passwords for several time would cause most phones to be permanently locked.

Rehab i’m not sure but i hope this

Utwddjhudzslwpei9eurjfhyrf hi87tegd