QUESTION $8$

$\backslash$table$[[2,$A$,$B$,$C$,$D$,$E$],[1,$Salesperson,Region,,Account,Order Amount,Month$],[2,$Albertson, Kathy,East,$29386,$$$925\mathrm{.}00,$January$],[3,$Brennan, Michael,,$82853,$$$400\mathrm{.}00,$January$],[4,$Davis, William,South,$55223,$$$235\mathrm{.}00,$February$],[5,$Dumlao, Richard,West,,$$400\mathrm{.}00,$January$],[6,$Flores, Tia,South,$97446,$$$1,500\mathrm{.}00,$March$],[7,$Post, Melissa,East,$78532,$$$765\mathrm{.}00,2],[8,$Thompson, Shannon,,$91987,$$$875\mathrm{.}00,$January$],[9,$Walters, Chris,South,$55667,,$January$],[10,,,,,]]$

This table does not meet entity integrity requirements because:

a$.$ The Month column contains a null.

b$.$ The Region column contains multiple nulls.

c$.$ The Order Amount column contains a null.

d$.$ The Account column contains a null.