What is the radius of a circle whose equation is open paren x plus 5 close paren squared plus open paren y minus 3 close paren squared is equal to 4 squared ?

A circle in standard form is (x − h)² + (y − k)² = r², where r is the radius. Here the right side is 4², so the radius is 4 units, not 4² = 16 units. Therefore, the correct choice is B) 4 units.

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