When the unit of production method of depreciation is used, which of the following best describes depreciation expense? O a Depreciation expense will vary directly with output. Ob. Depreciation expense will vary directly with sales. OC. Depreciation rate per unit will vary directly with output. O d. Depreciation rate per unit will vary directly with sales. Which of the following is correct with respect to the accounting for "investment properties"? O a Under ASPE, either the cost or fair value model may be used. Ob. Under IFRS, either the cost or fair value model may be used. Oc. Under ASPE, either the revaluation or fair value model may be used. od Under IFRS, either the revaluation or fair value model may be used How is income and expense recognized for biological assets under IFRS? O a Changes in fair value. Ob. Percentage of completion method. Oc. Completed contract method. O d. Cash basis