If angle C of a triangle ABC is a right angle, then what is tan A + tan B equal to?

• A. \(\frac{{{a}^{2}}-{{b}^{2}}}{ab}\)
• B. \(\frac{{{a}^{2}}}{bc}\)
• C. \(\frac{{{b}^{2}}}{ca}\)
• D. \(\frac{{{c}^{2}}}{ab}\)