SAT Question a1ff8ce3: Words In Context answer and explanation

English - Words In Context - Fill In Blank Single Word
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As discussed by scholar Anna Mladentseva, many artworks produced in the mid-1990s to the early 2000s exclusively for exhibition on the internet, such as Sinae Kim’s Genesis (2001), have become inaccessible because viewing them requires the use of ______ software (most notably Adobe Flash, discontinued in 2021).
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Difficulty:Hard
Which choice completes the text with the most logical and precise word or phrase?