30. Multiple models have been proposed to explain intra-Golgi transport. Which of the following statements is correct?

(1) Vesicular transport models propose that cargo proteins move between stable Golgi cisternae via transport vesicles.

(2) Cisternal maturation readily explains the transport of very large cargo such as procollagen.

(3) Continuous retrieval of Golgi enzymes to earlier cisternae via transport vesicles is defined by the vesicular transport model.
(A) (1) only.
(B) (1) and (2).
(C) (2) and (3).
(D) (1) and (3).
(E) All of the above are correct.