After two months of hard work, the art fair is a huge success; both the students and their parents report having a great time, and the winning projects are even featured in the local newspaper. Talia is so proud of her team of teachers for everything they accomplished, and she is ready to reward them for their outstanding performance. Talia decides to surprise each member of her team with an extra vacation day, because she has learned that giving a(n) __________ reward can be very impactful, especially when it is well-timed. a.) intangible monetary b.) intangible non-monetary c.) competitive monetary d.) formal non-monetary