Read the text and determine if the sentence is true (see options at the end):

Singularity is an experimental operating system (OS) which was built by Microsoft Research between 2003 and 2010. It was designed as a high dependability OS in which the kernel, device drivers, and application software were all written in managed code. Internal security uses type safety instead of hardware memory protection.

Sentence: Microsoft Research made many revisions to Singularity when it was being built.
OPT: [-] Yes; [-] It's impossible to say; [-] No;
It's impossible to say