登录之后可查看解析

This would be the best method to minimize the likelihood of computer viruses infecting any of its systems. The program should be quarantined since it's possible that even the vendor's software can be infected.
The procedure of recompiling infected programs from source code backups does not minimize the likelihood of computer viruses infecting the system.
Restoring infected systems with authorized versions will be done when the system is already infected. Thus, it does not minimize the likelihood of computer viruses infecting the system.
Instituting program change control procedures is a good control practice, but it does not minimize the likelihood of computer viruses inflecting the system.