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.
Take context from the input text and decide on the accurate relationship between 'Edward Snowden' and 'National Security Agency' from the options provided.
Options: headquarters location, employer, business division, parent organization