Classify the given statements under the headings 'self pollination ' and 'cross pollination'.
a. Transfer of pollen grains from the anther to the stigma of the same flower.
b. Transfer of pollen grains from the anther to the stigma of a different flower.
c. No need of pollinators to transfer pollen grains.
d. Produces large amounts of pollen grains.
e. Requires pollinators to transfer pollen grains.