Refer the given diagram showing three states of matter X, Y and Z and select the correct option to answer the questions that follows.
a -Which of the states of matter has no definite volume but can be compressed?
b -Which of the states of matter has definite volume but no definite shape?
| a | b | |
| A | Z | X |
| B | X | Z |
| C | Y | X |
| D | Z | Y |