A solid-state drive (SSD) is a non-magnetic storage device that uses flash memory to store data. It is preferred in situations requiring high durability, speed, and reliability over several years. Unlike traditional hard drives, SSDs have no moving parts and are immune to magnetic fields, which makes them a better choice for long-term data storage in critical projects. SSDs also offer faster read/write speeds compared to hard drives or tape drives.
A USB flash drive is a viable non-magnetic option but typically has smaller storage capacities and less durability for long-term projects.
Tape drives are magnetic and used mainly for archival storage, not frequent access.
Hard disks are magnetic and susceptible to physical damage and slower performance over time.
Reference:
CompTIA A+ Core 1 (220-1001) Exam Objectives
Official CompTIA IT Fundamentals (ITF+) Certification Training

Explanation
Spreadsheet software is a type of software that allows users to enter text and numbers in a grid of cells and perform calculations and analysis on the data. Spreadsheet software can also produce charts that demonstrate sales figures or other trends. Examples of spreadsheet software are Microsoft Excel, Google Sheets, and LibreOffice Calc.
References: CompTIA IT Fundamentals+ Study Guide: Exam FC0-U61, Second Edition, Chapter 7: Software Installation and Functions, page 266.

Explanation
Processor speed is measured in hertz (Hz), which is the number of cycles per second that the processor can perform. The higher the processor speed, the faster the processor can execute instructions. Gigahertz (GHz) is equal to one billion hertz, while megahertz (MHz) is equal to one million hertz. Megabits per second (Mbps) and gigabits per second (Gbps) are units of data transfer rate, not processor speed. Therefore, 3.6GHz would indicate the fastest processor speed among the options given. References: CompTIA IT Fundamentals+ Study Guide: Exam FC0-U61, Second Edition, Chapter 3: Computing Components, page 114.