When a primary key from one table is connected to another table, it is said to be a ________ key

Jeff, a user connected to the wireless network, takes a laptop from his desk to a conference room. Arriving at the conference room, Jeff realizes that the laptop is in process of reconnecting to the wireless network. Which of the following is a common wireless problem that can cause this issue?

A. Mismatched SSID B. Incorrect encryption type C. Weak signal strength D. Increased latency

Combining two character items using two vertical bars (||) is known as ________.

a. Combining b. Character modification c. Concatenation d. Casting