The goal of teaching 90% of the 4-year old students to tie their shoes is a SMART goal because it is Specific (teaching a specific skill), Measurable (90% of the students), Attainable (assuming it is possible to teach 4-year olds to tie their shoes), Relevant (related to the job of a daycare employee), and Time-bound (assuming there is a specific timeframe for achieving the goal). Therefore, the correct answer is: Yes, smart goals are realistic and attainable.