A company called irobot makes a robot that does chores around the house. their robots also serve the u.s. army. packbot carries out missions that involve explosives and other devices that ordinarily would put soldiers' lives in danger. packbot can travel on steep terrain, fall off cliffs, and cross streams. it can also carry equipment, such as cameras, which soldiers can then safely control from a distance. civilian irobot products have many controls, too—an owner can order a robot to clean a specific room and shut itself off when it is finished. maybe someday, we will have a robot that can pick up clutter off the floor! do it! the packbot is _________.
a. educational
b. menacing
c. collapsible
d. durable
