# Consider the following in respect of natural numbers a, b and c :

1. LCM (ab, ac) = a LCM (b, c)

2. HCF (ab, ac) = a HCF (b, c)

3. HCF (a, b) < LCM (a, b)

4. HCF (a, b) divisible LCM (a, b)

Which of the above are correct?

(a) 1 and 2 only

(b) 3 and 4 only

(c) 1, 2 and 4 only

(d) 1, 2, 3 and 4