Consider the blockchain technology we discussed in class (nonce, hash outputs, etc.). If you were to try a single random integer as a nonce, what would be the probability, p, of obtaining a hash output that begins with four zeros? Everything else (transactions that go into the block, etc.) is unchanged. Pick the answer closest to your calculations (~ indicates approximation). Hint: You need to recall the properties of a hash output that we learned in class. Also, consider that each digit of the hash output can take 16 different values, either an integer from 0 to 9 or a letter from a to f.