$($TCO $3)$ Given a Customer entity class with a CustomerId property for its primary key, which of the following defines a foreign key property if it$$s coded in another entity class named Invoice?

Group of answer choices

public int CustomerId $\{$ get; set; $\}$

public int InvoiceId $\{$ get; set; $\}$

public Invoice Invoice $\{$ get; set; $\}$

public Customer Customer $\{$ get; set; $\}$