I have the following situation: 


A server certificate (CServ) is signed by self-signed certificate (C0)
A client certificate (CCli) is signed by CServ
Client's trust-store contains C0, so the client application can trust CServ


Note: C0 is actually a simulation of a CA certificate for testing purposes.

Now, let's consider a situation when C0 either is expired or not yet valid. Since it's stored in client's trust-store, is it still trusted? In other words is chain [C0, CServ] still valid?


Question: Differences in student load at liberal arts colleges vs. research universities
Answer: You are making several unfounded assumptions:


That courses are always 3 credits, so that "4 courses per semester" means 12 credits. I have taken courses that were worth 1, 2, 3, 4, and 5 credits. Many of the science courses I've taken, including math and computer science courses, have been worth 4 credits. Basic sciences that involve a lecture, lab, and recitation have sometimes been 5 credits.
That most liberal arts colleges follow the LACS recommendations to the letter. 
That the LACS recommendations somehow suggest that less than 120 credits are required for graduation. Here is an example of a liberal arts college following the LACS recommendations for CS and requiring 120 credits. 


I did half of my undergraduate degree at a liberal arts college and then transferred to a large research university for the other half. There was virtually no difference in my courseload between the two - I took exactly one credit more in my two years in the research university. I just pulled up my transcripts, and this is what I took each semester:

Part 0

I transferred in 30 credits in humanities, etc. from college courses taken while in high school.

Part 1 - Liberal Arts College


16 credits, 4 classes (4, 3, 4, 5)
13 credits, 3 classes (4, 4, 5)
(Summer) 3 credits, 1 class (3)
19 credits, 5 classes (3, 4, 5, 4, 3)
12 credits, 4 classes (3, 3, 4, 2)


Part 2 - Research University


16 credits, 4 classes (4, 4, 4, 4)
19 credits, 5 classes (4, 3, 4, 4, 4)
16 credits, 6 classes (3, 4, 1, 3, 3, 2)
13 credits, 4 classes (4, 3, 3, 3)


(My undergraduate degree was in Electrical Engineering, with a minor in Computer Science.)