Four yoga trainers A, B, C & D take classes in a month. Pie chart shows total hours distribution taken by these all four trainers to take classes....

Four yoga trainers A, B, C & D take
classes in a month. Pie chart shows total hours distribution
taken by these all four trainers to take classes. Read the
data carefully and answer the questions.

Note:
(i) They take classes for 1 hour (Basic classes), 2 hours
(Regular classes) and 3 hours (Advance classes). No
trainer can leave class before time and can not take
class for any extra time.
(ii) D does not take any regular classes. He will take either
basic or advance class.

Trainers B and C conduct all three types of classes. The number of Basic classes taken by B equals the number of Regular classes taken by him. C conducts four Regular classes in the month. If the number of Advance classes taken by B and C are the same, find the minimum and maximum number of Basic classes taken by C.