Which of the following statements about antivirus software is not true? $\_\_\_\_\_$

a$.$

Antivirus software uses signature$-$based recognition and behavior$-$based recognition to detect malware.

b$.$

Antivirus software is $100$ percent effective against malware intrusions.

c$.$

Antivirus software can detect, contain, or eliminate malware.

d$.$

Antivirus software can detect various types of malware