\\\\((i)\\\\) In a \\\\(distance- time\\\\) graph, the constant speed of a truck will be represented by a straight line.\\\\((ii)\\\\) In a \\\\(distance- time\\\\) graph, a straight parallel to the time axis indicates that the truck is not moving.\\\\((iii)\\\\) A curved line on the \\\\(distance- time\\\\) graph indicates that the truck is moving with a speed which is not constant.\\\\((iv)\\\\) In a \\\\(distance- time\\\\) graph, the constant speed of a truck will be represented by a straight line.Hence, option \\\\(c\\\\) is correct answer.