A phone number (excluding the area code) consists of seven digits in a specific order, and digits may repeat. Suppose you already know the last three digits of a person's phone number from a form they filled out. If you randomly guess the remaining four digits, what is the probability that you correctly guess the entire phone number?

• A. $0.1$
• B. $0.01$
• C. $0.001$
• D. $0.0001$