A、Marks and thumbprints, and printed, typed, or stamped signatures are acceptable in addition to written ones. B、Marks and thumb

When the words "without recourse" or words with similar meaning are used as part of the endorsement, such endorsement is referred to as qualified endorsement. The purpose of this type of endorsement is to limit the endorser’s liability. The qualified endorsee, however, may look to all other parties prior to the qualified endorser. Under the UCP, the term "signature" also includes marks and thumbprints and printed, typed, or stamped signatures are acceptable in addition to writ ten ones. The rule also applies to endorsements. In the United States. the endorsement on an instrument need not necessarily be applied by the previous holder.
28．What’s the purpose of qualified endorsement?
29.About the qualified endorsees, which of the f10llowings is true?
30.According to UCP, what does the term "signature" include?