In the following diagram. the 'circle' stands for 'soldiers', the 'square' stands for 'Indians', and the triangle stands for 'singers'. The numbers given in the different segments represent persons belonging to that category.

Which category is represented by the number '5'?

A

Indian singers vvho are not soldiers

B

Indian soldiers who are not singers

C

Indians who are neither singers nor soldiers

D

Indian singers who are soldiers