Match the columns I and II, and choose the correct combination from the options given.
Column I Column II When stamens unite into more than two bundles a1EpipetalousWhen stamens are attached to the petalsb2EpiphyllousWhen stamens are attached with perianthc3DidelphousWhen stamens are attached with perianthc4Polyadelphous
b. a-4, b-1, c-2