Multiply and collect similar terms: \((\frac12a -\frac13b)(\frac12a +\frac 13b)\)

A. \(\frac14a^2-\frac19b^2\)
B. \(\frac14a^2 +\frac19b^2\)
C. \(\frac14a^3-\frac19b^3\)
D. \(\frac14a^3 +\frac19b^3\)

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