Which of the following statements are true?(a)  If a number is divisible by 3, it must be divisible by 9.(b) If a number is divisible by 9, it must be divisible by 3.(c)  A number is divisible by 18, if it is divisible by both 3 and 6.(d) If a number is divisible by 9 and 10 both, then it must be divisible by 90.(e)  If two numbers are co-primes, at least one of them must be prime.(f)  All numbers which are divisible by 4 must also be divisible by 8.g)  All numbers which are divisible by 8 must also be divisible by 4.(h)  If a number exactly divides two numbers separately, it must exactly divide their sum.(i)  If a number exactly divides the sum of two numbers, it must exactly divide the two numbers    separately.