What is the best definition of remote sensing?

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a̶n̶a̶l̶y̶z̶i̶n̶g̶ ̶d̶a̶t̶a̶ ̶b̶y̶ ̶m̶e̶a̶n̶s̶ ̶o̶f̶ ̶c̶o̶m̶p̶u̶t̶e̶r̶ ̶s̶o̶f̶t̶w̶a̶r̶e̶

gathering data without physical contact with the object being observed

using technological equipment to gather data about the world

collecting environmental data without human input