Note the differences
between system options, data set options, and statement options.
remain in effect for
all DATA and PROC steps in a SAS job or current process unless they
are respecified.
apply to the processing
of the SAS data set with which they appear. Some data set options
have corresponding system options or LIBNAME statement options. For
an individual data set, you can use the data set option to override
the setting of these other options.
control the action
of the statement in which they appear. Options in global statements,
such as in the LIBNAME statement, can have a broader impact.