Unlock this challenge:
Imagine the following property:
#[Column()] private ?string $city = null;
Which of the following changes would require a database migration?
-#[Column()] +#[Column(nullable: false)] private ?string $city = null;
#[Column()] - private ?string $city; + private string $city = '';
-#[Column()] +#[Column(type: Types::STRING)] private ?string $city = null;
-#[Column()] +#[Column(type: Types::TEXT)] private ?string $city = null;
