Which of the following is more reasonable about the formation of glycolipids?(   )
A、It is first synthesized in the smooth endoplasmic reticulum and then transported to the Golgi complex and gradually added with different glycols. 
B、It is initially synthesized in the cis Golgi network (CGN) and then added different glycosylated groups at different parts of the golgi complex.
C、It is first synthesized on the cytoplasmic side of the smooth endoplasmic reticulum, then it is flip-floped to the inner side of the endoplasmic reticulum and modified with glycosyl grops. 
D、Both endoplasmic reticulum and Golgi complex can synthesize glycolipids independently, but the types of synthesis are different.