Jim with his parents _____ abroad. They _____ back in two weeks. [ ]

A. have gone; will come

B. has gone; will come

C. have been to; have come

D. has been; come

某县山坡上发现一具男尸。县公安局侦查人员接到报案后，赶赴现场进行了勘验和检查，勘验检查结束后，侦查人员制作了包括方案记载、绘制图片、照片等多种形式的勘验笔录。请问这些勘验笔录具有（）

A、固定证据

B、确定证据所表现的各种有关特征

C、确定侦查方向

D、鉴别其他证据