Production and sales estimates for April are as follows:Estimated inventory (units), April 19,000Desired inventory (units), April 30 18,000Expected sales volume (units):Area A 3,500 Area B 4,750 Area C 4,250Unit sales price $20The number of units expected to be manufactured in April is:Choose the correct answer:a.12,000 b.11,000 c.13,000 d.9,500