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.
OPT is a 1 year work permit given to students after completing graduate degree program in the United States. You have to find a job within 90 days of that 1 year period after graduation, or else you become out of status. If your employer is enrolled in the eVerify program, you can get up to 29 months of OPT. You have to apply for H-1B visa while in OPT.