Explanation
802.11b is the wireless standard that supports speeds up to 11Mbps and operates on the 2.4GHz band. 802.11b is one of the earliest versions of the IEEE 802.11 family of standards for wireless local area networks (WLANs). 802.11b uses direct-sequence spread spectrum (DSSS) modulation to transmit data over radio waves. 802.11b has a maximum theoretical data rate of 11Mbps and a typical range of up to 150 feet indoors or 300 feet outdoors. 802.11b operates on the same frequency band as some cordless phones, microwaves, and Bluetooth devices, which may cause interference or signal degradation. References : The Official CompTIA IT Fundamentals (ITF+) Study Guide (FC0-U61), page 171.

Explanation
Product key licensing is an example of utilizing a personalized code for continuous personal access to a software product. A product key is a unique alphanumeric code that is required to activate or register a software product, such as an operating system or an application. A product key ensures that the user has a legitimate copy of the software and prevents unauthorized use or distribution. Site licensing is a type of licensing that allows an organization to install and use a software product on multiple devices within a specific location, such as a school or a company. Open-source licensing is a type of licensing that allows anyone to access, modify, and distribute the source code of a software product, such as Linux or Apache. Single-use licensing is a type of licensing that allows only one installation and use of a software product, such as a game or an antivirus program. References: CompTIA IT Fundamentals (ITF+) Study Guide: Exam FC0-U61, Second Edition, Chapter 5: Database Fundamentals and Security Concepts, page 175

Data definition is the process of creating, modifying, or deleting the structure and objects of a database, such as tables, fields, indexes, and views. Data definition is performed using data definition language (DDL), which is a subset of SQL commands. An administrator can use DDL to grant or revoke permissions for a user to access data in a database. Reference : The Official CompTIA IT Fundamentals (ITF+) Study Guide (FC0-U61), page 144.

Explanation
A primary key is a value that uniquely identifies a database record or a row in a table. A primary key can be a single column or a combination of columns that have unique values for each record. A primary key ensures that each record can be distinguished from others and prevents duplicate data. For example, in a database that stores information about employees, the employee ID column can be used as a primary key for each employee record56. References := CompTIA IT Fundamentals (ITF+) Study Guide, 2nd Edition, Chapter 5: Database Fundamentals3; What is Primary Key? - Definition from Techopedia7

An intranet application is a type of application that is hosted on a private network and can only be accessed by authorized users within an organization. An intranet application would best describe an employee portal that employees can access when they are at work, but not from home without a VPN connection. A VPN (Virtual Private Network) is a technology that creates a secure and encrypted tunnel between a client device and a remote server over the Internet. A VPN can allow employees to access the intranet application from home by connecting to the private network of the organization. Local application, extranet application, and Internet application are not types of applications that describe an employee portal that employees can access when they are at work, but not from home without a VPN connection. References: CompTIA IT Fundamentals+ Study Guide: Exam FC0-U61, Second Edition, Chapter 5: Database Fundamentals, page 199.