Which of the following is not true about the ramp function?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/07/signals-systems-questions-answers-experienced-q10.png"><img alt="Integral of unit step is ramp function" class="size-full wp-image-221250" height="49" src="https://www.sanfoundry.com/wp-content/uploads/2018/07/signals-systems-questions-answers-experienced-q10.png" width="123"/></a>
• B. r (t) = t u (t)
• C. Ramp function with unit slope is integral of unit step
• D. Integral of unit step is a ramp function of unit slope