Even if a trip from home to your office (or other principal place of business) has a specific business purposeâfor example, to meet with a client at your officeâit is still considered commuting and is not eligible for a mileage deductible if you start out from your home.
If /DEBUG is specified, the default for /OPT is NOREF, and all functions are preserved in the image. To override this default and optimize a debugging build, specify /OPT:REF. Because /OPT:REF implies /OPT:ICF, we recommend that you also specify /OPT:NOICF to preserve identical functions in debugging builds. This makes it easier to read stack traces and set breakpoints in functions that would otherwise be folded together. The /OPT:REF option disables incremental linking.
There are three types of Pre-completion OPT: Type A: During the student's annual vacation. Student must intend to register for the next term; OPT may be part- or full-time; Type B: While school is in session. Student must be registered full-time; OPT may be part-time only; Type C: After completion of all course requirements (excluding thesis/dissertation) 1  After completion of all course requirements excluding thesis/dissertation. 2  If Type C OPT is part-time, student must be registered full-time. 3  If Type C OPT is full-time, student need not be registered.