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

Question $24$Select one:

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.