How did Sony Electronics achieve a $40\%$ increase in sales forecast accuracy?

Question $6$ options:

Sony fired half of its staff and became a subsidiary of Wal$-$Mart Stores, Inc.

Sony instituted additional security measures to protect its own sales data and decreased the number of staff with access to critical data.

Sony used both its Sales & Operations Planning plan along with its Collaborative Planning, Forecasting, & Replenishment process to increase forecast accuracy.

Sony increased its asset base by $18\%$ and invested an additional $20\%$ in statistical tools.