The correct answer is option 2, Article 311.

Article 311 of the Indian Constitution provides constitutional safeguards to civil servants. This article ensures that civil servants have certain protections and safeguards against arbitrary actions or removals.

Article 311 states that a civil servant cannot be dismissed, removed, or reduced in rank without an inquiry. This means that before any action is taken against a civil servant, there must be a proper inquiry conducted to establish their guilt or misconduct. This inquiry provides the civil servant with an opportunity to defend themselves and present their case.

Furthermore, Article 311 also guarantees that a civil servant has the right to a reasonable opportunity for promotion. This means that their career progression should be based on merit and performance, and not arbitrary decisions.

In summary, Article 311 of the Indian Constitution ensures constitutional safeguards for civil servants by mandating that they cannot be dismissed or removed without an inquiry and providing them with a reasonable opportunity for promotion.