Select all the statements that are true about Python's unittest module and Django's test framework:

a. Django's test framework builds on Python's unittest module

b. Django's TestCase class is a sub-class of unittest.TestCase

c. A collection of unit tests is called a "test suite"

d. Unit tests are run using the same database that the programmer uses for the development server

e. HTML assert methods (such as assertHTMLEqual) are already part of Python's unittest.TestCase