In the context of interprocess communications (IPC) in Unix/Linux, which of the following are true about signals, shared memory and pipes? Select one or more: a. Concurrent two-way communication between two processes can be achieved with the use of a single pipe. ob. Shared memory is fast because it is buffered by the operating system kernel. C. If Process A needs to send the string "Hello World" to Process B, Process A may send a signal to achieve this. d. A process may have a handler function set up to handle the SIGINT signal, or may choose to ignore it. Oe. Virtual memory enables the allocation of shared memory for IPC. f. Unnamed pipes can only be used to share data between related processes (e.g. parent process and its child process), whereas named pipes can be used to share data between processes that are unrelated. In the context of interprocess communications (IPC) in Unix/Linux, which of the following are true about sockets and message queues? Select one or more: a. We do not normally need worry about managing concurrency when using sockets and message queues as this will be managed by the operating system kernel. ob. To successfully establish a socket connection between a server process and a client process, the client needs to know the address of the socket and connect to it, whereas the server process needs to be listening on that particular socket and accept the incoming connection request. c. Each message in a message queue can be associated with a type, and a process that reads data from a message queue can specify which type of messages it would like to read. d. When using message queues to communicate between processes, the messages that are sent between processes can be of different lengths. e. Two-way communication between a server process and a client process cannot be achieved with a single socket connection between that server and that client