The following statements are given: [P] Conformational isomers are interconvertible by rotation around a single bond while configurational isomers cannot be interconverted without breaking a bond. [Q] Configurational isomers could be optically active or optically inactive while conformational isomers are optically inactive [R] Geometric isomers must have a double bond in their structures [S] Geometric and optical isomers are the two distinct categories of configurational isomers. Choose the correct combination of statements.