Quantitative Aptitude Number System LCM and HCF

If two positive integers x and y are written as x = a2b3 and y = a3b and a and b are prime numbers, then HCF (x, y) is:

1
\(ab^2\)
2
\(a^2 b^2\)
3
\(ab\)
4
\(a^2 b\)

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