Which of the following could most likely serve as an ionophore? 
Definitions:
S&P 500
An index comprising 500 of the largest companies listed on stock exchanges in the United States.
DJIA
The Dow Jones Industrial Average (DJIA) is a stock market index that measures the stock performance of 30 large companies listed on stock exchanges in the United States, often used as an indicator of the overall health of the US stock market.
Tax Free Municipal Bond
A debt security issued by a state, municipality, or county to finance its capital expenditures, exempt from federal taxes and, in some cases, state and local taxes.
Taxable Yield
The yield on an investment before the adjustment for taxes, representative of the income an investor would receive if it were not taxed.
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