Java is a case sensitive language. Which is the most appropriate statement with respect to this context?

1. Upper and lower case letters are distinguished.
2. Upper and lower case letters are ignored.
3. Only lower case letters are distinguished.
4. None.

Which of the following package is needed to find the square root of a number?

1. java.text
2. java.math
3. java.lang
4. None

The most suitable statement for BlueJ is:

1. It is a window based platform.
2. It is a DOS based platform.
3. It is a window based and DOS based platform.
4. None.