Arrange the following decimals in ascending order: 0.7, 0.07, 0.007, 0.0007
0.0007, 0.007, 0.07, 0.7
0.7, 0.07, 0.007, 0.0007
0.07, 0.007, 0.0007, 0.7
0.007, 0.07, 0.7, 0.0007