English to Chinese Tech/Engineering Computers: Software Advertisement

Here is another one:

Source text:
"For best results, use photos with at least a 1024 x 768 pixel resolution and a 4 x 3 aspect ratio."

I have three translations from three different translators
1.a 4 x 3 aspect ratio = 4x3英寸的高宽比
2.a 4 x 3 aspect ratio = 4x3英寸的高宽比例
3.a 4 x 3 aspect ratio = 4x3的高宽比

Please keep in mind this translation meant to be used in the mainland China.

Please write your comments in English.

Thanks!