When a __________ method or block is running on an object, the object is locked so no other such method can run on that object at the same time.

Which type of preview shows how a picture option will modify a picture?

A) Page layout B) Print C) Live D) Artistic

Why might a music player fail to play a given file?

A. the file format is unsupported B. another file is already playing C. the file is stored on the memory card D. the volume is too high