Select the set of classes the relationship among which is best represented by the following Venn diagram. 
Students, Part-time workers, Girls
Engineers, Illiterates, Urban residents
Females, Mothers, Sisters
Mammals, Human beings, Reptiles
Select the correct mirror image of the given combination when the mirror is placed at 'PQ' as shown.
Select the option in which the given figure is embedded (rotation is NOT allowed). 