While reviewing the equipment account for errors, the chief accountant noted that the value of equipment has increased. The increase can be caused by:

i A purchase of additional equipment

ii An expenditure that is related to a routine maintenance

iii An expenditure that extends the life of the equipment

iv An expenditure that increases the equipment's productivity

Select one:

a. All of i, ii, iii and iv

b. i or ii only

c. i or iii only

d. i only