Public key infrastructure (PKI) depends heavily on certificate authorities (CA) to instill trust in transactions taking place across the public Internet. CAs are often referred to as "trusted" authorities, but how can a user genuinely confirm whether an authority should be trusted? What does "trust" mean when referring to a certificate authority? How would you go about determining whether a CA can or should be trusted?

7. the cullerton park district holds a mini-olympics each summer. create a class named participant with fields for a name, age, and street address. include a constructor that assigns parameter values to each field and a tostring() method that returns a string containing all the values. also include an equals() method that determines two participants are equal if they have the same values in all three fields. create an application with two arrays of at least eight participants each—one holds participants in the mini-marathon, and the other holds participants in the diving competition. prompt the user for participant values. after the data values are entered, display values for participants who are in both events. save the files as participant. java and twoeventparticipants. java.