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1.--autodefault option VfrCompile will generate default opcodes for questions if some default are missing. 2 --checkdefault option VfrCompile will check whether every question has no default or has all default. If not, will generate an error to let user know the question misses default. Cc: Liming Gao <liming.gao@intel.com> Cc: Eric Dong <eric.dong@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Dandan Bi <dandan.bi@intel.com> Reviewed-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>