Given the following classes:

Which two options fail to compile when placed at line n1 of the main method?

Given the code fragment:

What is the result?

Given the code fragment:

Which two modifications should you make so that the code compiles successfully? (Choose two.)

Which two statements are true for a two-dimensional array of primitive data type?

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?