Determine whether each description best refers to a sole proprietorship, partnership, corporation, or limited liability company $($LLC$).$

$\backslash$table$[[$Description$],[$a$.$ Raymond and Amy own Security Services. The business is not a separate legal entity.$],[\backslash$table$[[$b$.$ Physio Products does not pay a business income tax and has one owner. The owner has$],[$unlimited liability for business debt.$]]],[\backslash$table$[[$c$.$ Riley and Kay own Speedy Packages, a courier service. Both are personally liable for the$],[$debts of the business.$]]],[\backslash$table$[[$d$.$ Lannister owns Wealth Management. The business is a separate legal entity and pays an$],[$additional business income tax.$]]],[\backslash$table$[[$e$.$ Oscar, Angela, and Kevin own Accounting Solutions. The business has an indefinite life and$],[$pays an additional business income tax.$]]],[\backslash$table$[[$f$.$ Ownership of Zander Company is divided into $1,000$ shares of stock. The company pays a$],[$business income tax.$]]],[\backslash$table$[[$g$.$ Russell is the sole owner of Wilson Sports. The business is not a separate legal entity from$],[$Russell and the business ends with his death.$]]],[$h$.$ Trent Company is owned by Trent Malone, who is personally liable for the company's debts.$]]$