What does the epidermis of vertebrate skin contain?

Gap junctions are -

The cellular layers in the epidermis of the skin consist of:

The four sketches $(A, B, C$ and $D)$ given below represent four different types of animal tissues. Which one of these is correctly identified in the options given,along with its correct location and function?

Which of the following statements is/are correct regarding epithelial tissue?
$a$ - Cells are compactly packed.
$b$ - Cells have little intercellular matrix.
$c$ - It can be single or multi-layered.

The basement membrane of epithelial tissue is composed of what?