Are the boats on opposite tacks?
See the definitions of Tack, Leeward and Windward.
Which boat, if either one, is obliged to keep clear?
See Rule 10 - ON OPPOSITE TACKS
Have the boats kept clear at the final point in the illustration?
See the definition of Keep Clear.
If a give way boat is not keeping clear, what obligation, if any, does the right of way boat have?
See Rule 14 - AVOIDING CONTACT and Rule 43 - EXONERATION.