A fair (unbiased) coin was tossed four times in succession and resulted in the following outcomes: (i) Head, (ii) Head, (iii) Head, (iv) Head. The probability of obtaining a ‘Tail’ when the coin is tossed again is

1. $0$
2. $\dfrac{1}{2} \\$
3. $\dfrac{4}{5} \\$
4. $\dfrac{1}{5}$