Which one of the following statements is correct?
(a) Preamble of the Constitution is the part of the Constitution and can be amended under Article 368
(b) Preamble of the Constitution is not a part of the Constitution and cannot be amended
(c) Preamble is the part of the basic structure of the Constitution and can be amended only if no change in the basic structure is made
(d) Preamble can be amended by Parliament simply by an objective Resolution
