The Venn diagram given below shows the artists in a Music School. The ‘Triangle’ represents ‘Pianist’, ‘Circle’ represents ‘Drummers’, ‘Rectangle’ represents ‘Guitarist’ and the ‘Square’ represents ‘Singers’ . The numbers given in the diagram represent the number of persons of that particular category. How many singers are also pianists and guitarists but not drummers ?

Options

A. (a) 9
B. (b) 7
C. (c) 5
D. (d) 12