The trading volume for 3M Corporation for the previous five weeks was as follows:

March 31: 50,000 shares;

March 24: 38,000 shares;

March 17: 44,000 shares;

March 10: 40,000 shares;

March 3: 42,000 shares

3M Corporation is listed on an exchange and has 4.2 million shares outstanding. What is the maximum number of shares an insider can sell under Rule 144 on April 4 of the following year?

41,000

42,000

43,000

44,000