Question: For a program that reads three letter grades and calculates an average of those grades, which of the following would be a good design based

For a program that reads three letter grades and calculates an average of those grades, which of the following would be a good design based on stepwise refinement?

Group of answer choices

Write one method that reads three letter grades, and a second method to convert each letter to a number and calculate the average of the three numbers.

Write one method that reads three letter grades, converts each letter grade to a number, and calculates the average of the three numbers.

Write one method that reads a letter grade and returns the number equivalent, and one method that computes the average of three numbers.

Stepwise refinement cannot be applied to this problem.

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