According to the New Cartesian Sign Convention, which of the following sets of signs is mathematically correct for a real object forming a real image in a concave mirror?

Options:

• A: Object distance (u) is negative, Image distance (v) is positive, Focal length (f) is negative.
• B: Object distance (u) is negative, Image distance (v) is negative, Focal length (f) is negative.
• C: Object distance (u) is positive, Image distance (v) is negative, Focal length (f) is positive.
• D: Object distance (u) is negative, Image distance (v) is negative, Focal length (f) is positive.

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