Find the domain of f(x)=log4(x2−10x+21)f(x) = \log_{4}(x^2 - 10x + 21)f(x)=log4(x2−10x+21).
x<3 or x>7x < 3 \text{ or } x > 7x<3 or x>7
3<x<73 < x < 73<x<7
x>10x > 10x>10
x>0x > 0x>0