valid enforceable contract must include, among other things, offer and acceptance, which is measured $-$ as discussed in our materials $-$ by an objective legal standard $($rather than by a subjective standard$).$ What is the "objective standard" of a court's review of whether the parties' words$/$conduct rise to what is legally considered offer & acceptance $($and hence possibly an enforceable contract$)?$ Provide a factual$/$hypothetical example in your answer to explain the concept.