Application trends and drivers that increase the need for application security are:

Intelligent browsers alone represent only one driver; selecting this omits the equally significant contributions of webification and targeted attacks.

Webification alone is only one factor; it does not account for the risks introduced by advanced browsers and targeted attack campaigns.

Targeted attacks alone are only one driver; omitting intelligent browsers and webification gives an incomplete picture of why application security demand has risen.

Intelligent browsers execute complex client-side logic that attackers can exploit, webification expands the attack surface by moving business functions online, and targeted attacks use customized techniques against specific applications - all three simultaneously increase application security requirements, making 'all of the above' correct.