Vanessa is firewall administrator in her company; her company is using Check Point firewalls on central and remote locations, which are managed centrally by
R80 Security Management Server. One central location has an installed R77.30 Gateway on Open server. Remote location is using Check Point UTM-1 570 series appliance with R71. Which encryption is used in Secure Internal Communication (SIC) between central management and firewall on each location?