MULTIPLE CHOICE

Directions: In the space provided, place the letter of the BEST selection for each of the following statements or questions.

$\_$D $1.$ Refer to the diagram below. Which activity is allowed?

a$.$ Having NULL values for Jersey c$.$ Having a NULL value for Team$\_$Id

b Having NULL values for Position d$.$ All are allowed

B $2.$ Assuming that nulls are allowed in foreign keys, which of the following will one$-$to$-$many relationship prevent?

a$)$ deleting a record from the N side without first deleting the corresponding entity from the $1$ side

b$)$ deleting a record from the $1$ side without first deleting the corresponding entities from the N side

c$)$ adding a record to the N side without first having a corresponding entity in the $1$ side

d$)$ adding a record to the $1$ side without first having a corresponding entity on the N side