(Reuters) - Warren Buffett's Berkshire Hathaway Inc on Friday said it boosted its stake in cable TV operator Charter Communications Corp, and signaled it may have another large investment planned after agreeing to buy Precision Castparts Corp in its largest-ever purchase.
In the context of the input sentence, determine the relationship between 'Berkshire Hathaway' and 'Charter Communications'.
Options: owner of, business division, developer, subsidiary