31. 題組背景描述如附圖。若想用 openssl 的指令完成產生並儲存自簽伺服器憑證，下列指令何者正確？
(A) openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyoutselfsigned.key -out selfsigned.crt
(B) openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyoutselfsigned.key
(C) openssl req -x509 -days 365 -newkey rsa:2048 -keyout selfsigned.key-out selfsigned.crt
(D) openssl generatekey -x509 -nodes -days 365 -newkey rsa:2048-keyout selfsigned.key -out selfsigned.crt