Which of the following is not true for the security kernel prototyped by MITRE?

Question $22$ options:

It directly managed the system's physical resources with less than $20$ subroutines in less than $1000$ source lines of code.

It was the first security kernel

Able to identify what is necessary to build a security kernel that implements a Reference Monitor

Unable to identify what is necessary to build a security kernel that implements a Reference Monitor