$25.$ From problem $24,$ if the market price of the put option is $$7\mathrm{.}50($underpriced$),$ what would be the steps in creating risk free arbitrage profit?

a$.$ Sell one put with a strike of $105,$ Short $0\mathrm{.}50$ units of the stock, Invest $$60\mathrm{.}98$ for one period at the rate$$r$=1\mathrm{.}025$

b$.$ Buy one put with a strike of $105,$ Short $0\mathrm{.}50$ units of the stock, Invest $$60\mathrm{.}98$ for one period at the rate$$r$=1\mathrm{.}025$

c$.$ Sell one put with a strike of $105,$ Buy $0\mathrm{.}50$ units of the stock, Borrow $$60\mathrm{.}98$ for one period at the rate$$r$=1\mathrm{.}025$

d$.$ Buy one put with a strike of $105,$ Buy $0\mathrm{.}50$ units of the stock, Borrow $$60\mathrm{.}98$ for one period at the rate$$r$=1\mathrm{.}025$