How Was the Dwarf Planet Pluto Discovered

How was the dwarf planet Pluto discovered?

A) by prediction using Newton's laws to account for the deviations from uniform orbits of Uranus and Neptune
B) by the infrared cameras on the IRAS spacecraft
C) by Voyager spacecraft cameras, which were used between planetary encounters to survey the planetary system
D) by searching photographs of the sky for an object that moved against the background of distant stars

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