The plural of futures forward/futures contract is forward/futures contract.

Long-$ TERM is similar to an adjective, so there is generally no plural

For example, long-term investment.

The plural number of the exchange is also directly added with s, but if it is a proper term such as futures exchange and stock exchange, it is unnecessary to use plural number at this time.

Like options, forward contracts, singular and plural numbers, in fact, there is no big problem.

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As a general term, you can use the singular.

For example, options are a means ... (Choice is a way ...) Similarly, forward/futures contracts can be used in this way.

If there is a specific one or several, for example, I bought a lot of options (S), mainly depending on whether you bought one or more.

Singular and plural, in fact, the problem is really not big.