Which of the following terms is given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts?

Question

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Spectroscopic binaries are identified by observing periodic Doppler shifts in the spectra of the stars, which indicates that they are orbiting around their common center of mass. Eclipsing binaries are identified by observing periodic changes in the brightness of the stars as they eclipse each other, visual binaries can be directly observed as two separate stars, and double stars refer to any two stars that appear close to each other in the sky but do not necessarily orbit each other.

Which of the Following Terms Is Given to a Pair