Given the code from the Greeting.Java file:

Which set of commands prints Hello Duke in the console?

Given the following code:

What is the output?

Which code fragment causes a compilation error?

You are developing a banking module. You have developed a class named ccMask that has a maskcc method.
Given the code fragment:

You must ensure that the maskcc method returns a string that hides all digits of the credit card number except the four last digits (and the hyphens that separate each group of four digits).
Which two code fragments should you use at line n1, independently, to achieve this requirement? (Choose two.)

Which three statements are true about the structure of a Java class?