Question

https://media.glynlyon.com/g_pal_2011/7/img_test_parallelogram.gif
Reanna was asked to find the perimeter of the following parallelogram. She measured the lengths of the sides, and then added two of the lengths to two of the widths. Her answer was 20 centimeters. Which of the following statements is true?
Reanna's answer is correct.
Reanna should have multiplied 6 centimeters by 4 centimeters.
Reanna should have multiplied her answer by 1/2.
Reanna should have added 4 centimeters and 6 centimeters.