Which of the following is a difference between read$-$only memory $($ROM$)$ and random access memory $($RAM$)?$Question $7$ Select one:a$.$ROM is volatile memory, whereas RAM is nonvolatile memory.b$.$ROM is secondary memory, whereas RAM is main memory.c$.$ROM is nonvolatile memory, whereas RAM is volatile memory.d$.$ROM is main memory, whereas RAM is secondary memory.