A Consumer Advocacy Group Rates the Quality of a Cellular $A \cap B \cap C$

A consumer advocacy group rates the quality of a cellular service provider using three
criteria.
A: Service is available at least 99% of the time.
B: Reception is clear at least 95% of the time.
C: Fewer than 5% of its customers have complaints about the quality of service. a. Describe the event represented by $A \cap B \cap C$ .
b. Describe the event represented by $A \cup B \cup C$ .