What are the requirements when creating a data class in Kotlin?

1. The primary constructor must have at least one parameter marked with val or var.
2. The class cannot be abstract, open, sealed, or inner.
3. The class cannot inherit from other classes.
4. The class can implement interfaces.

The compiler automatically generates the following functions for data classes:

• equals()
• hashCode()
• toString()
• componentN() (for destructuring)
• copy()