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Which of the following actions will NOT have an effect ( either positive or negative ) on the likelihood of a user in your database

Which of the following actions will NOT have an effect (either positive or negative) on the likelihood of a user in
your database receiving the error message "snapshot too old"?
a.
The value for the parameter UNDO_RETENTION is increased.
b.
The value for the parameter UNDO_RETENTION is decreased.
c.
Applications that produce long-running reports are scheduled to run at night so they don't interfere with interactive user queries during the day.
d.
The number of redo log file groups is increased from 2 to 3.
e.
Interactive users querying a table always add FOR UPDATE at the end of their SELECT , even if they seldom perform an UPDATE command on those rows.

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