Which of the following is an example of ottonian architecture?
a. clerestory
b. gallery
c. arcade
d. all of the above

The answer is "d. all of the above".
Clerestory, gallery and arcade are the examples of Ottonian architecture. 

Ottonian Architecture is a structural style which advanced during the rule of Emperor Otto the Great. The style was found in Germany and endured from the mid tenth century until the mid eleventh century. Ottonian design draws its motivation from Carolingian and Byzantine engineering. Clerestory, gallery and arcade are the examples of Ottonian architecture. In which arcade progression of arches supported by columns, clerestory refers to a clear glass window that is situated close to the top of the church in Ottonian design and gallery is between the arcade and the clerestory.

i believe the answer is  the similarity is that both are sacrifices which have the same purpose and sacrifice - jesus christ, but the difference is in offering of that sacrifice.

 

the similarity is that both are sacrifices which have the same purpose (repenting our sins) and sacrifice - jesus christ.  the difference is in the way of the offering that sacrifice. the sacrifice of jesus on the calvary is sacrifice of his actual living body and blood, but the sacrifice of the mass is the sacrifice of the jesus through bread (body) and blood (wine). in the sacrifice on calvary jesus was offered for us; while at mass he offers himself through us.