What can be inferred from paragraph 1 about Giovanni Battista Della Porta's contribution to the camera obscura?

• He translated a Chinese description of the use of the camera obscura and made the technique available to artists.
• His convex lens made the projected image easier to trace.
• His version of the camera obscura allowed for the later addition of a mirror.
• His improvements relied heavily on design changes proposed earlier by Leonardo da Vinci.

This is a multiple choice.