Which description correctly explains the deaths of Cassius and Brutus?

ACassius stabs himself due to the information that Brutus has been killed; Brutus is killed by Octavius.
BCassius and Brutus are both killed by Octavius.
CCassius and Brutus are both killed by Mark Antony.
DCassius asks Pindarus to kill him with his own sword; Brutus runs onto his own sword, which is held by Strato.