When Creating Transgenic Bacteria,plants,and Animals

When creating transgenic bacteria,plants,and animals

A) any cell may be used as long as is does not have a cell wall.
B) only eggs may be used for animals while and cell may be used for plants and bacteria.
C) only eggs may be used for plants and animals while any cell may be used for bacteria.
D) only eggs may be used to create any transgenic organism.
E) transgenic bacteria are created first and then used to create transgenic plants and animals.