Problem: Are developmental milestones conceptualized as discrete, categorical, all-or-none moments in time? Need Assignment Help? A. Yes, developmental milestones are hard-and-fast check categorical checked boxes of whether a child did or did not accomplish a behavior B. No, developmental milestones are age-ranges and are considered alongside other domains and abilities such as hearing C. Yes, developmental milestones are categorical behaviors without regard for personal factors of time of day, health, setting or caregiver that might affect the child's presentation D. Both A & C