A U$.$S$.$ firm has a $100,000$ payable with a $3-$month maturity. Which of the following will hedge the foreign exchange exposure?

a$.$

Buy a call option on $100,000$ with a strike price in dollars.

b$.$

All of the above

c$.$

Take a long position in a forward contract on $100,000$ with a $3-$month maturity.

d$.$

Buy the present value of $100,000$ today at the spot exchange rate, invest in the U$.$K$.$ at i$.$