A comma-delimited file uses commas to separate values in a record

MysteryClass -first: int-second: double;+MysteryClass()+MysteryClass(int)+MysteryClass(double);+MysteryClass(int, double)+setData(int, double): void+getFirst(): int+getSecond(): double+doubleFirst(): int+squareSecond(): double+print(): void+equals(MysteryClass): boolean+makeCopy(MysteryClass): void+getCopy():MysteryClassWhich of the following would be a default constructor for the class MysteryClass shown in the accompanying figure?

A. public MysteryClass(){ setData(0, 0.0); } B. public MysteryClass(0, 0.0) { setData(); } C. public MysteryClass(0) { setData(0, 0.0); } D. private MysteryClass(10){ setData(); }

Entries in the DIB are arranged in a tree structure called the ____________________.

Fill in the blank(s) with the appropriate word(s).