单项选择题

A. history-pviB. alias emacs=viC. HISTCMD=viD. set -o v……

Many people like the vi text editor but the default bash command line editor recognizes emacs keystrokes. What command entered into a bash initialization file will have bash recognize vi keystrokes after login？（）

A. history-pvi
B. alias emacs=vi
C. HISTCMD=vi
D. set -o vi
E. unset emacs

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