Question: To quit, a user types ' q ! . To continue, a user types any other key. Which expression evaluates to true if a user

To quit, a user types 'q!. To continue, a user types any other key. Which expression evaluates to true if a user should continue?
key=?'q
(!key)=?'q'
(:key==('')'}
key!='q
 To quit, a user types 'q!. To continue, a user types

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