Identify the two reasons for the SQL statement failure?

Evaluate the following SQL commands:

The command to create a table fails. Identify the two reasons for the SQL statement failure?

A.
You cannot use SYSDATE in the condition of a check constraint.

B.
You cannot use the BETWEEN clause in the condition of a check constraint.

C.
You cannot use the NEXTVAL sequence value as a default value for a column.

D.
You cannot use ORD_NO and ITEM_NO columns as a composite primary key because ORD_NO is also
the foreign key.

Explanation:
CHECK Constraint
The CHECK constraint defines a condition that each row must satisfy. The condition can use the same
constructs as the query conditions, with the following exceptions:
to the CURRVAL, NEXTVAL, LEVEL, and ROWNUM pseudocolumns
Calls to SYSDATE, UID, USER, and USERENV functions
Queries that refer to other values in other rows
A single column can have multiple CHECK constraints that refer to the column in its definition.There is no limit to the number of CHECK constraints that you can define on a column.
CHECK constraints can be defined at the column level or table level.
CREATE TABLE employees
(…
Salary NUMBER(8, 2) CONSTRAINT emp_salary_min
CHECK (salary > 0),