Step 1: The task.
Identify the features of a bicollateral vascular bundle.
Step 2: What it means.
In a bicollateral bundle, phloem is present on both sides of the xylem, with a strip of cambium separating each phloem from the xylem.
Step 3: Checking feature A.
A says it is a conjoint vascular bundle. This is correct, because here xylem and phloem lie together on the same radius. So A is right.
Step 4: Checking feature B.
B says phloem is on either side of the xylem, separated by cambium. This is exactly the definition of a bicollateral bundle. So B is right.
Step 5: Checking feature C.
C says it is a radial vascular bundle. This is wrong, because in radial bundles xylem and phloem sit on different radii, which is not the case here. So C is incorrect.
Step 6: Conclusion.
Only A and B are correct. Therefore the correct answer is "A and B". \[ \\boxed{\\text{A and B}} \]