Analyze the relationship between 'stock market' and 'Stock Exchange' within the context of the input sentence.
Options: parent organization, operator, legal form, manufacturer

Even though the Chinese government has persistently been trying to prevent further stock market losses by drawing the line around the 3,500 level for the Shanghai Stock Exchange Composite Index (SHCOMP), it is questionable whether it will continue to provide support in order to sustain this market level indefinitely, as it is proving to be a very expensive exercise.
operator