Which Postfix command can be used to rebuild all of the alias database files with a single invocation and without the need for any command line arguments?

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1. B correct. newaliases
   Initialize the alias database. If no input file is specified (with the -oA option, see below), the program processes the file(s) specified with the alias_database configuration parameter. If no alias database type is specified, the program uses the type specified with the default_database_type configuration parameter. This mode of operation is implemented by running the postalias(1) command.
   Note: it may take a minute or so before an alias database update becomes visible. Use the “postfix reload” command to eliminate this delay

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