What will be the output? Javascript variable vs object

Hello Mate,
Let's discuss problem statement.

We have code snippet we have to tell the output and why?

If we assign a Object to a variable so it's copy by reference but with other variable it's only copy values.

For example: If we create a object and assign to another variable and then change value in second variable so it's impact on your source object also but it's not happen with other types of variable.