Explanation:

- Option 1: 49% - This refers to a previous FDI limit where foreign investors could invest up to 49% through the automatic route in the defence sector.

- Option 2: 51% - Typically, a 51% holding indicates majority control, but this has not been the limit for automatic FDI in defence.

- Option 3: 74% - This is the correct option. The FDI limit in defence manufacturing under the automatic route was raised to 74% to encourage more foreign investment and technology transfer.

- Option 4: 80% - There is no historical basis for an 80% FDI limit under the automatic route in the defence sector.

- Option 5: 30% - This is not relevant. A 30% limit does not align with known FDI policies in defence.