Consider a binary code with 5 bits (0 or 1) in each code word. An example of a code word is 01010. In each code word, a '0' bit is a zero with probability 0.8. What is the probability of having exactly 3 zeros in a code word?
a) 0.2016
b) 0.4096
c) 0.2048
d) 0.1024