Grade$-$level leads from each grade in an elementary school are meeting over the summer to reevaluate the alignment of social studies objectives. This meeting will ensure that classroom learning objectives are aligned to the state standards, and that specific materials and content of lessons progress logically from grade to grade to prevent unintended gaps and unnecessary repetition. Which of the following best describes this type of meeting?

a

department meeting

b

horizontal team meeting

c

campus leadership meeting

d

vertical team meeting