If I want to have a high-quality programming.

Select one or more: a. You should always optimize your code for performance. b. If your computer gets daily backups, you don't need a version control system. C. Python allows Doctests to be defined for modules, classes, and functions. d. Variable names should be very short for efficiency. e. Doctests should be located in a file dedicated to testing, separate from the code they test. f. Doctests are useful because they function both as automated tests and as demonstrative documentation for programmers. g. Documentation of source code doesn't matter for single- programmer projects. h. Unit tests including Doctests should only try very typical expected values for inputs and parameters