The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral t...........

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The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft.” The experiment in question refers to

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UPSC CSP Previous Year Paper (2020)

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Voyager-2

New Horizons

LISA Pathfinder

Evolved LISA

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Explanation:

LISA Pathfinder was a proof of concept mission with arm size reduced to 40 cm, as compared to the million km long arm in the actual LISA.
The Laser Interferometer Space Antenna (LISA) is a mission led by the European Space Agency to detect and accurately measure gravitational waves—tiny ripples in the fabric of space-time—from astronomical sources. LISA would be the first dedicated space-based gravitational wave detector. It aims to measure gravitational waves directly by using laser interferometry.
The LISA concept has a constellation of three spacecraft arranged in an equilateral triangle with sides 2.5 million km long, flying along an Earth-like heliocentric orbit. The distance between the satellites is precisely monitored to detect a passing gravitational wave.

Hence option 4th is correct.

For More: http://blogs.cardiff.ac.uk/physicsoutreach/gravitational-physics-tutorial/evolved-laser-interferometer-space-antenna-elisa/