Ahmad is choosing a password to access his teacher’s web page. He must choose a capital letter and three nonrepeating digits from 0 through 9. The letter can be in any position in the password. Which shows part of the sample space for Ahmad’s password?

A password must contain exactly one capital letter and three different digits, with the letter allowed in any position. Choice A shows the same capital letter and three nonrepeating digits arranged in several positions: A135, 135A, 1A35, and 13A5. Choice B repeats digits, while C includes lowercase letters and D has no letters.

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