Which of the following sets contains only natural numbers?
{0,1,2,3}\{0, 1, 2, 3\}{0,1,2,3}
{1,2,3,4}\{1, 2, 3, 4\}{1,2,3,4}
{−1,0,1,2}\{-1, 0, 1, 2\}{−1,0,1,2}
{0.5,1,1.5,2}\{0.5, 1, 1.5, 2\}{0.5,1,1.5,2}