Explanation:

- Option 1: Intention to create legal relation:

A valid offer must be made with the intent to be legally bound if accepted. Social agreements usually don't count.

- Option 2: Unconditional terms:

Offers can have conditions and need not always be unconditional. It's the acceptance that must be unconditional, not the offer itself.

- Option 3: Certainty of terms:

The offer must be clear and definite so the terms can be understood and agreed upon.

- Option 4: Communication to the person to whom it is made:

An offer must be communicated so the person knows about it and can accept it.

Correct Answer: Option 2 - Unconditional terms