What is the most "secure" blocking protocol, "UDP or TCP", "IP" or using both?

Comodo Internet Security - CIS Firewall Help - CIS
#1

What protocol do i need to use if i want to completely block a software from making any kind of connection?

Ive always blocked via “advanced settings” and used protocol: “UDP or TCP” but just found out that the basic “block application” setting uses “IP” which made me confused. ???

#2

Protocol should be set to IP as that blocks at the network layer and all protocols at and above it.

#3

In CIS terms: IP = TCP, UDP and ICMP.

#4

Thanks for explaining, I was unable to find the difference in the user guide.