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Adriana is creating a point-of-sale (cash register) application for Fourth Coffee. Her responsibility is to create a password-protected login system to ensure security of the system. She has finished the login window and password check, but she is having trouble implementing it correctly.

Adriana’s project manager wants the system to give the user three attempts to login correctly before locking the system. In Adriana’s most recent version, the system prompts the user for a name and password three times—even if the user correctly logs in on the first try. After the third attempt, the system always locks—even if the input is correct.

1. Adriana is using a loop, which works best when:

a. the number of iterations is known and is unlikely to change during execution

b. the number of iterations is known but is likely to change during execution

c. the number of iterations is unknown

2. What control structure would be best for Adriana’s login system?

a. for loop

b. while loop

c. a recursive method

3. How many times does a do..while loop execute?

a. at least zero times

b. at least one time

c. at least two times