Explanation
### Why this is right
These shortcuts use the same key combinations across many Windows programs, with the letter key indicating the action. `Ctrl+O` opens a file, `Ctrl+N` creates something new, and `Ctrl+F` brings up search or find tools. `Alt+F4` closes the active window or program.
### The concept
A **keyboard shortcut** is a key combination that triggers a command without using a menu. The command often depends on the program, but these four combinations have common functions across many applications. Use **Open** to choose a file that already exists; use **New** to start a new window, tab, or document. **Find** searches for text or opens search tools in the current program. **Active window** means the window currently in use, so `Alt+F4` closes that window and may close the program if it is the program’s only window.
### The pairs
| Item | Matches | Why |
|---|---|---|
| `Ctrl+O` | B. Open an existing file or document | The `O` key is associated with the Open command, which lets you select a file already saved on your device. |
| `Ctrl+N` | C. Create a new window, tab, or document | The `N` key is associated with New, which starts a new item rather than opening an existing one. |
| `Ctrl+F` | D. Find text or open search tools | The `F` key is associated with Find, which searches within the current document, page, or program. |
| `Alt+F4` | A. Close the active window or program | This combination closes the window currently in use, or exits the program if that is its only window. |
### Terms
- **Ctrl**: Short for Control, a keyboard key held with another key to run a shortcut.
- **Alt**: Short for Alternate, a keyboard key held with another key to run a command.
- **F4**: Function key 4, one of the keys along the top of many keyboards; with Alt, it closes the active window.
- **Keyboard shortcut**: A key or key combination that runs a command directly.
- **Active window**: The window currently selected for use.
### Remember
`Ctrl+O` opens something that exists, `Ctrl+N` makes something new, `Ctrl+F` finds text, and `Alt+F4` closes the active window.
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