Multiple choice - Displayed correct answer is wrong when there are multiple correct options

When there is a multiple choice question where all answers are correct, moodle correctly tells the user that his choice was correct, but the text "Correct answer is: XXX" is not consistent/confusing.

Steps to reproduce:

• Create a new multiple choice question with 3 answers
• Disable answer shuffling (just for clarity)
• Give all answers a score of 100
• Take quiz, choose 2nd or 3rd answer

Result:

• "Correct answer is: answer 1"

Expected result (either would be logical):

• "Correct answers are: answer 1, answer 2, answer 3"
• "Correct answer is: CHOSEN ANSWER"
• No "Correct answer" message

Business logic case:

• We want the student to self assess at the start. Student has to choose "Low level", "Medium level" or "High level". As at least one question needs to have 100%, all answers are given 100% (even though the grade is set to 0)