Confused about behavior of ?. operator

Question

Here is my code

class Address
{
    public bool IsAppartment { get; set; }
}

class Employee
{
    public string Name { get; set; }
    public Address Addres         


        

Answer 1

UPDATE What will be equivalent code for following using short cut operators?
if (employee.Address != null && ? employee.Address.IsAppartment == true)

if (employee?.Address?.IsAppartment == true)