Utilize the input text as a context reference, choose the right relationship between 'Japan Post Holdings' and 'Japan Post' from the options.
Options: developer, subsidiary, chairperson, operator

And then given the current status and the announcement that they have made, Japan Post Holdings CEO, Mr. Masuda said, that with this clarity on Japan Post framework for disciplinary action, the Japan Post Group has largely met the five evaluation criteria established by the Japan Post Reform Execution Committee for resuming sales activities.
subsidiary