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.
Analyze the relationship between 'Edward Snowden' and 'National Security Agency' within the context of the input sentence.
Options: headquarters location, employer, business division, parent organization