Generalizing from the developmental milestones presented in the text, fifteen-month-old Katrina is predicted to have mastered all but which of the following gross motor skills?

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By fifteen months, most children have developed the ability to walk alone and stand alone, and some can walk backward. However, jumping usually develops a bit later in a child's motor skill progression.

Generalizing from the Developmental Milestones Presented in the Text, Fifteen-Month-Old