Shown below is information relating to the stockholders' equity of Robertson Corporation at December 31, 2017: 12% cumulative preferred stock, $150 par, 100,000 shares $1,500,000 authorized, 10,000 shares issued 900,000 Common stock, $1.50 par, 1,000,000 shares authorized, 600,000 shares issued 300,000 900,000 Additional paid-in capital: preferred stock Additional paid-in capital: common stock Treasury stock (at cost: 6,000 common shares) Retained earnings Refer to the above data. Calculate total stockholders' equity: 180,000 1,350,000 a. $5,130,000 O b. $4,770,000 oc. $4,950,000 O d. $3,600,000