In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: the area of rhombus is 150 cm square . the length of one of the its diagonals is 10 cm . the length of the other diagonal is :
Options: ['a ) 15 cm', 'b ) 20 cm', 'c ) 25 cm', 'd ) 30 cm', 'e ) none of these']
d