Final answer:
The correct answer is b. fully hidden. The four states of an Android activity are: Foreground, Background, Destroyed.
Step-by-step explanation:
The correct answer is b. fully hidden. The four states of an Android activity are:
Foreground: This is the state when the activity is visible and interacting with the user.
Background: In this state, the activity is no longer visible, but it is still running in the background.
Destroyed: When an activity is destroyed, it is completely removed from memory and is no longer running.
Fully hidden is not a valid state for an Android activity.