This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
The following is a passive process 
Select and explain. 
A. Diffusion, B. Facilitated diffusion, C. Secondary active transpo, D. Both 1 and 2
D: Both 1 and 2
Answer: D: Both 1 and 2 
Explanation: Passive transpo include: diffusion, facilitated diffusion Active transpo include primary active transpo, secondary active transpo, vesicular transpo.