Step 1: Concept
The Official Secrets Act 1923 is a British legislation that was enacted to protect the confidentiality of certain information held by the government. Violations of this act can lead to severe legal consequences, including imprisonment.
Step 2: Meaning
Arrest for violating the Official Secrets Act means an individual has been charged and apprehended under this law due to breaching confidential governmental information.
Step 3: Analysis
To determine which among the given options has not been arrested for violating the Official Secrets Act 1923, we need to consider each person's history.
Iftikar Gilani: He was involved in a case related to leaking classified information but was not arrested under the Official Secrets Act.
Santanu Saikia: He was arrested and charged under the Official Secrets Act for allegedly disclosing sensitive information.
Tarakant Dwivedi: He faced charges under the Official Secrets Act after being accused of sharing confidential documents.
Asseem Trivedi: He was also arrested and prosecuted under the Official Secrets Act for handling classified material.
From this analysis, it is clear that Iftikar Gilani has not been arrested for violating the Official Secrets Act 1923.
Step 4: Conclusion
Iftikar Gilani is the only individual among the given options who has not been arrested for violating the Official Secrets Act 1923.
Final Answer: (D)