Which line of code represents the correct syntax to establish a reference to a database handle?
$dbh = DBI::connect("dbi:mysql:myPhoneBook");
$dbh = DBD:->connect("dbi::mysql::myPhoneBook");
$dbh = DBD::connect("mysql:dbi:myPhoneBook");
$dbh = DBI->connect("dbi:mysql:myPhoneBook");
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