What is the correct way to cite a dictionary entry according to MLA style?

"Noon." The Oxford English Dictionary. Web. 2012. 2nd ed.

If your choices are the following:

1. "Noon." The Oxford English Dictionary. Web. 2012. 2nd ed.

2. Noon. The Oxford English Dictionary. 2nd ed. Print. 2012.

3. Noon. The Oxford English Dictionary. 2nd ed. Web. 2012.

4. "Noon." The Oxford English Dictionary. 2nd ed. 1989. Print.

Then the answer is number 4.