Чему равна сумма углов: \(\displaystyle 51^{\circ}53^{\prime}+21^{\circ}6^{\prime}56^{\prime \prime}\)?

• \(\displaystyle 56^{\circ}59^{\prime}72^{\prime \prime}\)
• \(\displaystyle 72^{\circ}56^{\prime}59^{\prime \prime}\)
• \(\displaystyle 72^{\circ}59^{\prime}56^{\prime \prime}\)
• \(\displaystyle 72^{\circ}56^{\prime}56^{\prime \prime}\)