Arrange the following strategic and administrative developments in the history of Magadha's capitals in chronological order (from earliest to latest): 1. Construction of the Cyclopean Wall of Rajgir to fortify the old capital. 2. Foundation of a watch-fort (Pataligrama) at the confluence of the Ganges and Son rivers by Ajatashatru. 3. Shifting of the imperial capital permanently to Patliputra by Udayin. 4. Temporary shifting of the capital to Vaishali by Shishunaga to counter the threat of Avanti. Select the correct answer using the code given below:

Options:

• A: 1-3-2-4
• B: 2-1-3-4
• C: 1-2-3-4
• D: 2-3-1-4

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