ACCORDING TO THE AUTHOR, THE PHRASE CONTACT MARKS MEANSA. DEFECTS C...

47. - DE THI THU DAI HOC MON ANH VA DAP AN
DE THI THU DAI HOC MON ANH VA DAP AN
47.According to the author, the phrase contact marks meansA. defects caused by cleaningB. marks on a coin caused by banging from other coinsC. defects in the minting processD. connections among coin dealers