Hello fellow members of French StackExchange, I am a beginner DELF A2 French learner and am having trouble with qui, qu' and que. I do understand the basic concept but am having trouble putting them into use into a real sentence.
For example, here is one of the questions I am doing.
Quel est l'appareil technologique le moins utile ____ tu as acheté? (qui, qu' or que goes into the blank)
For this question I am 100% sure that is is not qu' because qu' is the same as que but for a word beginning with a vowel. However, I am not sure about the other two.