Marisol is a geotechnical engineer tasked with recommending a type of pile to use for a large bridge over a river. She has determined that because bedrock cannot be easily reached, the construction crew will use a belling bucket to create a hole. Then they will pour concrete into a steel casing and leave the steel casing intact. Which of the following types of piles is this an example of? (Select all that apply.)

A) bell caisson pile
B) end-bearing pile
C) cast-in-place concrete pile
D) steel-shell-filled-with-concrete pile