What is a network externality? Select one: a. It refers to having a network of suppliers and buyers for a good or service. b. It refers to lobbying to form a public enterprise. c. It refers to a situation in which a product's usefulness increases with the number of people using it. d. It refers to a product that requires connection to a network for it to be useful.

Acase study allows a more detailed look at the life of a single subject than any other study.

Asequential circuit contains a register of four flip-flops. initially a binary number n (0000 ≤ n ≤ 1100) is stored in the flip-flops. after a single clock pulse is applied to the circuit, the register should contain n + 0011. in other words, the function of the sequential circuit is to add 3 to the contents of a 4-bit register. design and implement this circuit using j-k flip-flops.

Freya realizes she does not have enough in her bank account to use the debit card. she decides to use a credit card instead. which questions should freya answer before using a credit card? check all that apply. can i pay at least the minimum payment each month? can i make payments on time and avoid late fees? will i have to take out a loan? how much in finance charges can i afford to pay? should i talk to a consumer credit counseling service?