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Certification programs are offered by all of the following except

Assessment includes a. interviews, recorded conversations, videos, frequency counts, and time samples. b. formal standardized tests and developmental screening tools. c. various types of documented observations, documentation of child work, checklists, rating scales, and standardized tests. d. anecdotal notes, narratives or daily records, daily health checks, and teacher observation checklists.

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force