Which of the following is true when implementing a one-to-many relationship?A. The file on the many end has a concatenated key of its primary key and the one end key. B. The file on the many end has a foreign key consisting of the primary key on the one end. C. The file on the one end has a foreign key consisting of the primary key of the many end. D. The file on the one end has a concatenated key of its primary key and the many end key.

Use a physical stopwatch to record the length of time it takes to run the program. calculate the difference obtained by calls to the method system. currenttimemillis() just before the start of the algorithm and just after the end of the algorithm. calculate the difference obtained by calls to the method system. currenttimemillis() at the start of the program and at the end of the program so that the elapsed time includes the display of the result. use the value returned by the method system. currenttimemillis() just after the end of the algorithm as the elapsed time.