$\"\"$

The function is $\"\"$ .

The general form of cosine function is $\"\"$ .

Where $\"\"$ is amplitude and period $\"\"$ .

Compare the function with general form of cosine function.

Here amplitude is $\"\"$ .

The period is $\"\"$ .

Therefore, the cosine wave starts with an amplitude of $\"\"$ units at $\"\"$ and completes one cycle at $\"\"$ .

Observe the graph:

The graph (I) matches to the characteristics of the function $\"\"$ .

Hence, the graph (I) is the correct choice.

$\"\"$

The graph (I) is the correct choice.