Suppose that a, b, c and d are positive integers satisfying all of the following relations.
abcd=29⋅36⋅57
lcm(a,b)=22⋅31⋅52
lcm(a,c)=23⋅32⋅51
lcm(a,d)=24⋅33⋅53
lcm(b,c)=23⋅32⋅52
lcm(b,d)=24⋅33⋅53
lcm(c,d)=24⋅33⋅53
What is gcd(a,b,c,d)?
1
3
5
15
30