Which two statements are true regarding SQL statements that can be executed on the EMP_DETAIL table?

Examine the description of the EMP_DETAILS table given below:

Which two statements are true regarding SQL statements that can be executed on the
EMP_DETAIL table? (Choose two.)

A.
An EMP_IMAGE column can be included in the GROUP BY clause

B.
You cannot add a new column to the table with LONG as the data type

C.
An EMP_IMAGE column cannot be included in the ORDER BY clause

D.
You can alter the table to include the NOT NULL constraint on the EMP_IMAGE column

Explanation:
LONG Character data in the database character set, up to 2GB. All the functionality of LONG (and
more) is provided by CLOB; LONGs should not be used in a modern database, and if your
database has any columns of this type they should be converted to CLOB. There can only be one
LONG column in a table.
Guidelines
A LONG column is not copied when a table is created using a subquery.
A LONG column cannot be included in a GROUP BY or an ORDER BY clause.
Only one LONG column can be used per table.
No constraints can be defined on a LONG column.
You might want to use a CLOB column rather than a LONG column.