Which of the following is a true statement about remote sensing?
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I̶t̶ ̶a̶l̶w̶a̶y̶s̶ ̶r̶e̶q̶u̶i̶r̶e̶s̶ ̶s̶p̶e̶c̶i̶a̶l̶ ̶t̶r̶a̶i̶n̶i̶n̶g̶.̶

It is at least as old as the telescope.

It can only be done by scientists.

It was discovered in the 1960s.