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Which of the statements below is correct? September October Sales in units 15,000 12,000 Operating Expenses: Expense 1 $9,000 $7,500 Expense 2 $25,000 $25,000 Expense 3 $12,500 $11,000 Expense 4 $11,250 $9,000 Expense 5 $30,000 $24,000 Total Operating Expenses $87,750 $76,500 O Expenses 1 & 5 are mixed costs. Expenses 1 & 3 are mixed costs. Expenses 4 & 5 are mixed costs. Expenses 3 & 5 are mixed costs