The correct values and their datatypes are:

1. TRUE : SCALAR datatype
2. RECORD : COMPOSITE datatype
3. %ROWTYPE : REFERENCE datatype
4. BLOB : LOB datatype

Every constant, variable, and parameter has a datatype (or type), which specifies a storage format, constraints, and valid range of values.
PL/SQL provides many predefined datatypes. For instance, you can choose from

1. integer,
2. floating point,
3. character,
4. BOOLEAN,
5. date,
6. collection,
7. reference, and
8. large object (LOB) types.

PL/SQL also lets you define your own subtypes. This chapter covers the basic types used frequently in PL/SQL programs. Later chapters cover the more specialized types.