Question: Objects which are too far away to be seen with an optical telescope, may be seen if there is a galaxy between Earth and the

Objects which are too far away to be seen with an optical telescope, may be seen if there is a galaxy between Earth and the object. This is possible due to Einstein's prediction of:
Question 8 options:
gravitational lensing
a mass' increase in inertia
gravitational reshifting
the perihelion of Mercury

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