What is the product in simplest form? State any restrictions on the variable.
four a to the fifth power over seven b to the fourth power times two b squared over two a to the fourth power
A.four a to the ninth power over seven b to the sixth power where a does not equal zero and b does not equal zero
B.four a over seven b squared where a and b both do not equal zero
C.seven b squared over four a where a and b both do not equal zero
D.four over seven times a to the ninth power times b to the sixth power where a and b both do not equal zero