The case was initiated by Austrian activist Max Schrems, who claims that techniques used by the US National Security Agency (NSA) -- as revealed by whistleblower Edward Snowden -- meant that the privacy of his user data could not be guaranteed once it had been transferred across the Atlantic.
Refer to the input text as context and select the correct relationship between 'Edward Snowden' and 'National Security Agency' from the available options.
Options: employer, headquarters location, parent organization, business division