The greatest common factor of 15u2v3, 20u5v2, and 45u3v5 is
1. 45u^2v^21
2. 45u^5v^5
3. 5u^2v^2
4. 5u^5v^5
1. 45u^2v^21
2. 45u^5v^5
3. 5u^2v^2
4. 5u^5v^5