Olivia wants to use an inexpensive device to build a custom embedded system that can monitor a process. What option is best suited for this if she wants to minimize expense and maximize simplicity while avoiding the potential for system or device compromise?

An Arduino is a microcontroller well suited for the custom development of embedded systems. They are small, inexpensive, and commonly available. Unlike a Raspberry Pi, they are not a small computer, reducing their overall risk of compromise. A custom field-programmable gate array (FPGA) will typically be more complex and expensive than an Arduino, whereas a repurposed desktop PC introduces all the potential issues that a PC can include such as a vulnerable operating system or software.