Explanation:

Formula is 2^(n - 1) where n is the distinct primes in the factorized form of the number
480 = 2^5 * 3 * 5
3 distinct prime factors (2, 3 and 5)
So 480 can be written as the product of 2 co prime numbers in 2^(3 - 1) = 4 ways.

Hence, option 1 is the correct answer.