What is the chief purpose of line five in this code snippet?

override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_post_create)

if (savedInstanceState != null) return

val fragment = CreatePostFragment()
supportFragmentManager
.beginTransaction()
.add(R.id. fragment_container, fragment)
.commit()

}

• to make sure that the activity finishes when the savedInstanceState is not null
• to make sure that the activity creates a new fragment each time it is restored from a previous state
• to prevent the display of two fragments side by side in cases where the activity is restored from a previous state
• to prevent the creation of overlapping fragments in cases where the activity is restored from a previous state