In Python Pandas, while performing mathematical operations on series, index matching is implemented and all missing values are filled in with …………… by default.

1. Null
2. Blank
3. NaN
4. Zero

By restricting the server and encrypting the data, a software company's server is unethically accessed in order to obtain sensitive information. The attacker blackmails the company to pay money for getting access to the data, and threatens to publish sensitive information unless price is paid. This kind of attack is known as :

1. Phishing
2. Identity Theft
3. Plagiarism
4. Ransomware

Collection of hyper linked documents available on the internet is known as …………… .

1. Website
2. Webpage
3. Web Server
4. Web Hosting

…………… is a non-profit organization that aims to build a publicly accessible global platform where a range of creative and academic work is shared freely.

1. Creative Cost
2. Critical Commons
3. Creative Commons
4. Creative Common