Given GCD(a,b)=1\text{GCD}(a, b) = 1GCD(a,b)=1 and LCM(a,b)=77\text{LCM}(a, b) = 77LCM(a,b)=77, what could the pair (a,b)(a, b)(a,b) be?
(7,11)(7, 11)(7,11)
(1,77)(1, 77)(1,77)
(7,77)(7, 77)(7,77)
(11,77)(11, 77)(11,77)