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The accompanying graph above (Figure 15-1) clearly shows that ____.a.RR Lyrae stars can have longer pulsation periods than Cepheid variablesb.RR Lyrae stars are always dimmer than Cepheid variables.c.Type II Cepheid variables always have shorter pulsation periods than Type I Cepheidsd.Type I Cepheids are always more distant than Type II Cepheidse.Type I Cepheid variables are always brighter than Type II Cepheids

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