Detailed Solution:
The correct answer is “Tomb of Rabia-ud-daurani”.
The tomb called the "Second Taj Mahal" is: (3) Tomb of Rabia-ud-daurani
This tomb is actually known as Bibi Ka Maqbara, which translates to "Tomb of the Lady". It was built by Prince Azam Shah in memory of his mother, Dilras Banu Begum, also known as Rabia-ud-daurani.