Which of the following statements is true?

Question $4$ Select one:

Representing infinite values of R G and B color in the range of $0$~$255$ is an example of sampling

When representing Pi $3\mathrm{.}1415926...$ value in computer $,$ discretization is needed.

If noise is small enough, degraded analog data can be regenerated

Video uses $2430$ still frames per second to represent movement. This is an example of discretization

Mercury sphygmomanometer is an example of discrete representation of real world information