In the following sentence, which clause is the subordinate clause?

I can't do anything in the morning until I've had my first cup of coffee.

A. I can't do anything

B. in the morning

C. until I've had my first cup of coffee

D. my first cup of coffee

In the sentence:

I can’t do anything in the morning until I’ve had my first cup of coffee.

The subordinate clause is:

until I've had my first cup of coffee

Sentence could be simple (one independent clause), compound (two independent clause with coordinating conjunction), complex (a subordinate & independent clause) and compound-complex sentences (subordinate & two independent clause).