Mithali, a financial analyst, is preparing data engage in a data analysis project to predict revenue for the next period based on environmental considerations. She is currently reviewing the tables to validate inter$-$table rules for referential integrityWhich of th following is true about referential integrity? The primary key must be single$-$ valued, but the foreign key can be multi$-$valued The primary and foreign key fields can have different data types All values in a foreign key should also exist as values in the corresponding primary key The primary and foreign key fields must have the same name $.$