You are creating a persistent Azure Machine Learning compute cluster using the Python SDK v2 and must specify the minimum number of required properties.

Which two properties must you define? (Each correct answer presents part of the solution.)

# Corrected code block
compute_cluster = AmlCompute(
    name="cluster-name",
    type="amlcompute",
    size="STANDARD_DS3_v2",
    min_instances=0,
    max_instances=4,
    idle_time_before_scale_down=180
)