Indicate whether the following items are a $($a$)$ change in accounting principle, $(b)$ change in accounting estimate,

$($c$)$ change in reporting entity, or $(d)$ correction of an error.

The controller of H&P Company discovered that inventory held on consignment was counted as part of end$-$

ing inventory.

An investment in another company is now considered a subsidiary $($due to an increase in ownership interest$)$

and will be consolidated in the financial statement of the H&P Company.

H&P Company decided to change its inventory cost method from FIFO to the average$-$cost method.