The following amounts represent totals from the first three years of operations. calculate the balance of retained earnings at the end of 2021.
years net income (loss) ($) net cash flow ($) devidens ($) insurance of stock ($)
2019 1,200 500 200 2,000
2020 500 300 0 0
2021 2,300 2,800 200 0
(a) $2,600
(b) $4,600
(c) $3,100
(d) $3,500.

Problem 3: access control pokeygram, a cutting-edge new email start-up, is setting up building access for its employees. there are two types of employees: managers and engineers, and there are three departments: security, networking, and human resoures. each employee works in a single department, and each department is housed on a different floor. managers are allowed access to any floor, while engineers are allowed access only to their own floor. there are three badge-operated elevators, each going up to only one distinct floor. every employee has one badge. pokeygram wants to use the best possible access control method in order to minimize delay for the elevators (a) access control matrix, 1. which of the following would you recommend that pokeygram use: (b) access control lists, or (c) capabilities? make sure to justify your answer. 2. what, if any, would be the benefits (and/or disadvantages) of using rbac (role-based access control) in this situation? keep your solution for this problem limited to 10-12 lines of text.