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Select all the correct statements.

a. The no-arbitrage price of a bond is equal to its present value.

b. If there is an arbitrage opportunity, it means one can make a risk-free profit.

c. Small arbitrage opportunities may occasionally exist in real markets due to lack of information.

d. The law of one price is based on the no-arbitrage assumption.

e. Arbitrary investments and arbitrage generating investments are basically the same