What is the difference between a logical schema and a physical?

A、Thelogicalschemadefinestheoveralldatabasestructure,whilethephysicalschemadefineshowdataisstoredondisk.
B、Thelogicalschemadefinesdatatypesandconstraints,whilethephysicalschemadefinestablesandrelationships.
C、Thelogicalschemaisusedfordatamodeling,whilethephysicalschemaisusedforqueryoptimization.
D、Thelogicalschemaisdesignedbydevelopers,whilethephysicalschemaismanagedbydatabaseadministrators.