Explanation:

- To curb corruption: Demonetization was aimed at reducing the prevalence of black money, which is often tied to corrupt practices.

- To curb counterfeiting: High-denomination currency notes are particularly prone to counterfeiting. Demonetization aimed to curb this by nullifying old notes.

- To curb the use of high denomination notes for terrorist activities: Terrorist activities are often financed using high-denomination currency. The measure intended to disrupt these financial channels.

Option 4: All the above: The initiative targeted all these issues by invalidating high-denomination notes.

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