As per the provisions of the Central Industrial Security Force Act, which one of the following statements is correct?

The Central Industrial Security Force (CISF) Act, 1968, under Section 19, imposes restrictions on the fundamental rights of its members to ensure discipline and duty, as authorized by Article 33 of the Constitution.

• Option A is incorrect: Section 19(1)(a) prohibits a member from being associated with any political association without previous written sanction.
• Option B is incorrect: Section 19(1)(b) explicitly excludes organizations of a "purely social, recreational or religious nature" from the requirement of previous sanction.
• Option C is correct: Section 19(1)(c) provides an exception for the publication of any book that is of a "purely literary, artistic or scientific character." A book on the scientific dimension of cyber warfare falls under this exception.
• Option D is incorrect: Section 19(2) prohibits members from participating in any demonstration organized for political purposes, regardless of their leave status.