Arrange the following historical milestones in the evolution of Magadha's capitals and fortifications in chronological order (from earliest to latest): 1. Fortification of Rajgir with Cyclopean walls by Bimbisara. 2. Construction of a military watch-station (Patali-grama) by Ajatashatru. 3. Formal transfer of the imperial capital to Pataliputra by Udayin. 4. Temporary shift of the capital to Vaishali by Shishunaga. Select the correct answer using the code given below:

Options:

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

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