Explain if the following statements true or false?
(a) Income statements are used only by users external to the entity.
(b) Expenses are included in the income statement when they are paid, not when they are incurred.
(c) At the end of the reporting period, accrued expenses need to be included in the profit or loss determination.
(d) At the end of the reporting period, revenue received for services not yet provided needs to be included in the profit or loss determination.