Explanation

The F4 key is commonly used to repeat the last action in programs like Microsoft Word and Excel.

For example, if you format text or perform a specific action, pressing F4 will repeat it.

Explanation

There are three types of relationships that can exist between two tables:

• one-to-one.
• one-to-many.
• many-to-many.
  

Explanation

Blockchain technology is the foundation of cryptocurrencies like Bitcoin and Ethereum.

Explanation

Microsoft OneNote is used for creating, organizing, and sharing notes.

Explanation

Marcian Edward "Ted" Hoff Jr. is one of the inventors of the microprocessor.

In 1980, Hoff was named the first Intel Fellow, which is the highest technical position in the company.

He stayed in that position until 1983 when he left for Atari.

Explanation

Receiver's email address is required to send an email.

Without it, the email has no destination and cannot be delivered.

Explanation

The term Black Chain seems to be a misspelling or variation of Blockchain technology

Blockchain uses the three principles of cryptography, decentralization, and consensus 

Explanation

A Proxy Server primarily routes TCP/IP requests between clients and servers, enhancing security, privacy, and network performance.

Explanation

• Email was first introduced by Ray Tomlinson.
  • Email is a digital message sent from an author to one or more recipients.
  • Ray Tomlinson sent the first e-mail message as QWERTYUIOP in 1971.
  • Unwanted emails received in a folder is called Spam.
  • Gmail is a famous email service provided by Google.
  • The latest email systems technologies are based on a store-and-forward model.
• Charles Babbage is considered the "father of the computer".
• Antonio Meucci developed a voice-communication apparatus that several sources credit as the first telephone.

Explanation

Grace Hopper is credited with inventing the first compiler, which she called A-0, in 1952.

Hopper's A-0 compiler was operational on the Univac computer.