9. Computer Security - Various Attacks and Malware

Which among the following is not a security / privacy risk?
Now a days Vishing has become a criminal practice of using social engineering over which of the following? 
When some unidentified / unknown person / firm sends you mail in a trustworthy /lucrative way asking for sensitive banks and online payment information, this is a case of __?
Which among the following is the most common source of Viruses to the hard disk of your computer? 
Most of the internet banking sites provide which of the following feature to reduce the risk of keystroke logging for the password entry?

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