If two fair coins are flipped and at least one of the outcomes is known to be a head, what is the probability that both outcomes are heads?
A
$$\frac{1}{3}$$
B
$$\frac{1}{4}$$
C
$$\frac{1}{2}$$
D
$$\frac{2}{3}$$
Correct Answer: $$\frac{1}{3}$$