Which of the following is considered an ignition source? a: all answer choices are source of ignition b: cutting and welding c: lightning d: open flames

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's