Q$.$ Determine if the following are a product or period cost $1.$ Depreciation on automobiles used by the sales staff

$2.$ Salary of the chief executive officer of a company

$3.$ Glue used in the the production process

$4.$ Supplies for factory washroom

$5.$ Research and development costs

$6.$ Property taxes on factory building

$7.$ Salary of company controller

$8.$ Depreciation on furniture in factory lunchroom

$9.$ Cost of lubricating machinery

$10.$ Wood used in production process