All of the Following Are Security-Related Issues of M-Commerce Except

All of the following are security-related issues of m-commerce except:

A) Post-transaction security issues of auditing and nonrepudiation are less difficult because cell phones have the capability to store the digital equivalent of a receipt.
B) The basic security goals of confidentiality,authentication,authorization,and integrity are just as important for m-commerce as they are for e-commerce.
C) As the capabilities of cell phones and PDAs increase and converge,the threat of attack from malicious code increases.
D) An appropriate level of security must be maintained on each network that traffic flows through,in spite of the fact that interoperability among the various networks is difficult.