Noting that the company's network is vulnerable to viruses and spyware, the consultant has urged Infotech to upgrade its protections software, institute new policies for exchanging sensitive information, assembling a special team of information technology specialists to manage network security protocols

assembling a special team of information technology specialists for managing
assembling a special team of information technology that manages
and assemble a special team of information technology specialists for managing
and assemble a special team of information technology specialists to manage.

Please state your answer and reasoning behind it.

Thanks