Final answer:
Statements C and D are correct for standard changes, as they are typically low-risk with detailed procedures and can be automated. Statement A is only partially correct, and statement B is incorrect.
Step-by-step explanation:
The statements that are correct for standard changes are C and D:
C. Standard changes are typically low risk and have detailed procedures. This means that the actions required to implement a standard change are known, documented, and have been previously assessed to have minimal impact. As a result, they are considered low risk and can be performed relatively quickly.
D. Standard changes can be automated. Due to the routine nature and low risk of standard changes, many of these can be automated. Automation helps in reducing the time and resources required to carry out these changes and also minimizes human error.
While statement A is partially correct in that standard change procedures should be documented, it does not specify that they must be stored in a 'Knowledge base'. Statement B is incorrect because standard changes often do have change tasks, but these are usually predefined and follow a standard process.