Telegraphy remained the major technology for intercontinental communication well into the ________.

PDF is sometimes referred to as a _____ format because once a document has been converted to a PDF, it cannot be edited.

A. fixed-layout B. flexible-layout C. template D. fixed

If both the maxOccurs and minOccurs attributes are missing, the element is assumed to occur ____.

A. zero times B. once C. twice D. three times