One Key Aspect of E-Commerce Security Is Non-Repudiation

One key aspect of e-commerce security is non-repudiation. This refers to

A) Making sure that private information is not made available to non-authorized users
B) Making sure that the collected data is reliable and accurate
C) Making sure that collected data is made available in a timely manner
D) Ensuring that those who are using the data are really who they claim to be
E) Making sure that authorized users are not denied access to their data