Two positive integers a and b can be written as \(a = x^3y^2\) and \(b = xy^3\). Here, \(x\), \(y\) are prime numbers. Find \(LCM (a, b)\).
 
\(LCM (a, b)=\)
Answer variants:
\(xy\)
\(xy^3\)
\(x^3y^3\)