Context: Additionally, cable-ready TV sets can display HD content without using an external box. They have a QAM tuner built-in and/or a card slot for inserting a CableCARD.

Question: HD content can be displayed by cable-ready TVs without using what?
Answer: an external box

Question: Without using an external box, cable-ready TVs can display what?
Answer: HD content

Question: What features allow the cable-ready TVs to display HD content without an external box?
Answer: a QAM tuner built-in and/or a card slot for inserting a CableCARD

Question: What kind of built-in tuner will allow a cable-ready TV to display HD content without an external box?
Answer: QAM

Question: What kind of card will allow a cable-ready TV to display HD content without an external box?
Answer: CableCARD

Question: SD content can be displayed by cable-ready TVs without using what?
Answer: Unanswerable

Question:  Without using an internal box, cable-ready TVs can display what?
Answer: Unanswerable

Question:  What features allow the cable-ready TVs to display HD content without an internal box?
Answer: Unanswerable

Question: What kind of built-in tuner will allow a cable-ready TV to display HD content without an intenal box?
Answer: Unanswerable

Question: What kind of card will allow a cable-ready TV to display HD content without an external box?
Answer: Unanswerable