Ruth Anne was the production manager of Thrifty Manufacturing. When Daryl, the purchasing manager of Chatco Distributing, sent Ruth Anne an order for $10,000$ automotive tires which Thrifty manufactured at $$70$ each on sale through the end of the month, Ruth Anne replied: $"$We do not have the mode of tire that you ordered available at this time and will not during the advertised sale period, however, we will hold this offer open for you at the $$70$ sale price. What type of offer is Ruith Anne making and for how long will it be valid?

Multiple Choice

This is a merchant's firm offer and it will be valid for three months.

This is a merchant's firm offer and it will be valid for $30$ days.

This is a merchant's firm offer and it not be valid because it fails to state a time limit$.$

This is an option contract under common law and will be valid for three months.