Please order the following apparatus in ASCENDING order of resolution; when comparing resolution, the smaller the visible size, the greater its resolution.
1. Optical Microscope
2. Scanning Tunneling Microscope
3. Transmission Electron Microscope
4. Scanning Electron Microscope
Select one:
a. 1, 2, 3, 4
b. 3, 4, 2, 1
c. 2, 3, 4, 1
d. 1, 4, 3, 2