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.

Researchers measured the data speeds for a particular smartphone carrier at 50 airports. the highest speed measured was 78.1 mbps. the complete list of 50 data speeds has a mean of x overbarequals16.11 mbps and a standard deviation of sequals18.65 mbps. a. what is the difference between carrier's highest data speed and the mean of all 50 data speeds? b. how many standard deviations is that [the difference found in part (a)]? c. convert the carrier's highest data speed to a z score. d. if we consider data speeds that convert to z scores between minus2 and 2 to be neither significantly low nor significantly high, is the carrier's highest data speed significant? a. the difference is nothing mbps.