Why is water considered a polar molecule? (2 points) a. The molecule has no overall charge.
b. The oxygen and hydrogen atoms share electrons equally.
c. The atoms in the molecule have partial charges.
d. The molecule can only attract positive charges.

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.