Which of the Following Is True About Voting Trusts Related

Which of the following is true about voting trusts related to shares of corporate stock?

A) They can be oral or written, and are effective for an indefinite period of time.
B) They must be written, and cannot exceed ten years.
C) They can be oral or written, and cannot exceed ten years.
D) They must be written, and cannot exceed one year.
E) They must be written, and are valid for the remaining existence of the corporation.