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Question 1:
A standard user-defined function (UDF) refers to any function that
A. Takes one or more columns form a row and returns a single value
B. Takes one or more columns form many rows and returns a single value
C. Take zero or more inputs and produce multiple columns or rows of output
D. Detects the type of input programmatically and provides appropriate response
Feedback Examples functions are – concat, reverse etc.

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