Pick all that apply

• 1Choice 1.

  ARC is a compile-time mechanism where the compiler inserts retain/release calls, and the actual count changes happen at runtime

• 2Choice 2.

  ARC is a runtime feature where a separate thread periodically finds unreachable objects and reclaims them

• 3Choice 3.

  You can't put weak on a stored property of enum type

• 4Choice 4.

  A property declared weak must be a var and must be an optional type

• 5Choice 5.

  Declaring weak var owner: SomeClass? inside a struct turns that struct into a reference type