Which of following is the method by which data is converted from a readable form to an encoded version

Which of following is the method by which data is converted from a readable form to an encoded version

مندرجہ ذیل میں سے کون سا طریقہ ہے جس کے ذریعے ڈیٹا کو پڑھنے کے قابل فارم سے انکوڈ شدہ ورژن میں تبدیل کیا جاتا ہے۔
Explanation

Encryption is a means of securing digital data using one or more mathematical techniques, along with a password or "key" used to decrypt the information.