The lengths of three sides of a triangle are known. In which of the cases given below, it is impossible toget a triangle?

• A.  15cm, 12cm, 10cm
• B.  3.6 cm, 4.3 cm, 5.7 cm
• C.  17 cm, 12 cm, 6 cm
• D.  2.3 cm 4.4 cm, 6.8 cm