A signal which can be green or red with probability `4/5 and 1/5` respectively, is received by station A and then and 3 transmitted to station B. The probability of each station receiving the signal correctly is `3/4` If the signal received at station B is green, then the probability that the original signal was green is (a) `3/5` (b) `6/7` (d) `20/23` (d) `9/20`
A. `(3)/(5)`
B. `(6)/(7)`
C. `(20)/(23)`
D. `(9)/(20)`
Select the correct answer from above options