ROS中的/map话题的所属类型和定义是? A. nav_msgs/OccupancyGrid消息 std_msgs/Header header nav_msgs/MapMetaData info int8[] data B. nav_msgs/Map消息 std_msgs/Header header nav_msgs/MapMetaData info int8[] data C. nav_msgs/MapMetaData消息 time map_load_time float32 resolution uint32 width uint32 height geometry_msgs/Pose origin D. nav_msgs/Map消息 time map_load_time float32 resolution uint32 width uint32 height geometry_msgs/Pose origin