Secure is the correct answer for the above question.
Explanation:
When any person wants that any information is not hacked by any user then he needs to secure the information with the help of any security mechanism. This security mechanism can be of any type that facilities the user to stop the information are being hacked.
The above question asked about the work which is needed to stop the message is being hacked. So there is a need to secure the information. so secure is the correct option while the other option is not valid because "simple, economical or verifiable" can not stop the message from accessed by the unauthorized user.
Answer: the sample is not representative of the community.
Explanation:
Online surveys or surveys in general are made to obtain relevant information about a particular issue. If samples are not representative of that issue, they end up having little use.
