दरवाजे या खिड़की के फ्रेम के ऊपरी क्षैतिज सदस्य (horizontal member) को क्या कहा जाता है?

Which of the following statements conform(s) to panel walls in building construction? 1. Panel walls are external load bearing walls. 2. They are self supporting walls subjected to lateral loads. 3. They are primarily used in framed structures.

Which of the following statements conforms to 'corbels' in masonry?