Suppose We Need to Flip a Coin, but We Don't

Suppose we need to flip a coin, but we don't have one. However, we do have a random number table that we could use.
To simulate the outcome of tossing a coin you could assign random digits as follows:

A) one digit simulates one toss; even digits are heads, and odd digits are tails.
B) one digit simulates one toss; 0, 1, 2, 3, 4 are heads, and 5, 6, 7, 8, 9 are tails.
C) one digit simulates one toss; 0, 1, 4, 6, 9 are heads, and 2, 3, 5, 7, 8 are tails.
D) two digits simulate one toss; 00 to 49 are heads, and 50 to 99 are tails.
E) Any of the above would work.