Shahid and Rohit start from the same point in opposite directions. After each 1 km, Shahid always turns left and Rohit always turns right. Which of the following statements is correct ?

After both have travelled 2 km, the distance between them is 4 km.

They meet after each has travelled 3 km.

They meet for the first time after each has travelled 4 km.

They go on without ever meeting again.