context: United States President Barack Obama and key advisers introduced a series of regulatory proposals in June 2009. The proposals address consumer protection, executive pay, bank financial cushions or capital requirements, expanded regulation of the shadow banking system and derivatives, and enhanced authority for the Federal Reserve to safely wind-down systemically important institutions, among others. In January 2010, Obama proposed additional regulations limiting the ability of banks to engage in proprietary trading. The proposals were dubbed "The Volcker Rule", in recognition of Paul Volcker, who has publicly argued for the proposed changes.
question: ২০১০ সালের জানুয়ারিতে ওবামা কোন ধরনের ব্যবসায় ব্যাংকগুলোর অংশগ্রহণ সীমাবদ্ধ করার জন্য প্রবিধান প্রস্তাব করেছিলেন?
answers: proprietary