Which of the following clouds has the highest base?

a. stratocumulus

b. cirrocumulus

c. altocumulus

d. nimbostratus

Among the following type of clouds given, cirrocumulus is the type of cloud that has the highest base. The correct option among all the options that are given in the question is the second option or option "b". These are the type of clouds that can be seen as white puffs or sometimes as grey puffs, high up in the sky.