Refer to the given diagrammatic representation of distribution of water on Earth and select the correct statements for X. Y and Z. (i) X is a persistent body of dense ice that is constantly moving under its own weight. (ii) Y is found below the water table and rainwater is its main source. (iii) Z is an important source of water to the perennial rivers.

• A.  (i) and (ii) only
• B.  (ii) and (iii) only
• C.  (i) and (iii) only
• D.  (i), (ii) and (iii)