Kelly's collie puppy ran off, so she posts flyers in the neighborhood advertising a reward of $100 for finding and returning the dog. David finds a collie puppy on his front porch.He looks at the dog tags, calls the number, and Kelly rushes over to pick up her puppy. Later, David sees the reward poster.

• Can David claim the reward?Provide arguments for each party.In your response, include answers to these questions:

• What type of contract is involved here?
• Were the four elements of a valid (enforceable) contract satisfied?