What control character signals the end of input with the EOF signal? Ctrl-A Ctrl-E Ctrl-C Ctrl-B Ctrl-D If any sed command does not specify an address, then the command is applied to none of the above only the last input line no input lines each input line Previous After issuing the command chmod go+rx test.c, which of the following file permissions is possible for the regular file test.c? XrX -r-xr-xx-- --wu-w--W- --x-x------