Take context from the input text and decide on the accurate relationship between 'Goldman Sachs' and 'Investment bank' from the options provided.
Options: currency, product/material produced, subsidiary, developer

Investment bank Goldman Sachs (NYSE: GS-PB - news ) estimates the Chinese government has spent 1.5 trillion yuan ($234 billion) to support its stock market over the last three months, Bloomberg News reported.
product/material produced