An investor opens an account with bnz government securities, a broker-dealer limiting its transactions exclusively to securities issued by the u. s. government. the account holds $250,000 of treasury bonds, $250,000 of treasury notes, and $50,000 in cash. if bnz's broker-dealer business should fail, the investor would receive sipc protection in the amount of:
a. all of the securities & all of the cash, because u. s. gov't securities do not go bankrupt.
b. $50,000 of the cash & $450,000 of the securities.
c. $0.00.
d. $500,000 of the securities, none of the cash.