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The correct answer is option 4: 1, 2, 3 and 4.
Based on the information provided, aircraft engineering based industries are situated at all four locations marked as 1, 2, 3 and 4 on the map. This means that there are aircraft engineering based industries in all of the towns.
Option 1 includes towns 1, 2, and 3. While it correctly identifies three towns, it misses out on town 4 which is also indicated to have aircraft engineering based industries.
Option 2 includes towns 2, 3, and 4. It correctly identifies three towns, but it misses out on town 1, which is also indicated to have aircraft engineering based industries.
Option 3 includes towns 1 and 4. While it does capture two towns correctly, it omits towns 2 and 3, which are also indicated to have aircraft engineering based industries.
Therefore, the correct option is 4 - all four towns, 1, 2, 3, and 4, are indicated to have aircraft engineering based industries.